<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-358X</journal-id>
<journal-title><![CDATA[Investigación bibliotecológica]]></journal-title>
<abbrev-journal-title><![CDATA[Investig. bibl]]></abbrev-journal-title>
<issn>0187-358X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Investigaciones Bibliotecológicas y de la Información]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-358X2021000100185</article-id>
<article-id pub-id-type="doi">10.22201/iibi.24488321xe.2021.86.58257</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Experiences using national statistics while researching in 22 libraries in five countries]]></article-title>
<article-title xml:lang="es"><![CDATA[Experiencias utilizando estadísticas nacionales mientras se investigaba en 22 bibliotecas en cinco países]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Düren]]></surname>
<given-names><![CDATA[Petra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Laitinen]]></surname>
<given-names><![CDATA[Markku Antero]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Landøy]]></surname>
<given-names><![CDATA[Ane]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Repanovici]]></surname>
<given-names><![CDATA[Angela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hamburg University of Applied Sciences Faculty for Design, Media and Information ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Helsinki The National Library of Finland Communication and Cultural Services]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Finland</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Bergen Library  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Norway</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Transilvania University of Bra&#351;ov Faculty of Product Design and Environment ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Romania</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>35</volume>
<numero>86</numero>
<fpage>185</fpage>
<lpage>202</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-358X2021000100185&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-358X2021000100185&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-358X2021000100185&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract There is a growing need for libraries to use reliable and accessible data in order to show how good they are and perform in comparison to other libraries, since there is a constant reduction and closing down of libraries all over the world. One resource for assessment are national statistics. However while doing research in five countries, comparing 22 public and academic libraries, researchers had difficulties in finding key performance indicators they could use in national statistics. Therefore, another research project started which compared selected indicators from these five national statistics, describing the indicators, contrasting their quality and analysing which indicators were missing in some countries. Some other aspects are analysed as well, such as: which questions cannot be answered by national statistics, although they should, and what does it mean that not all libraries are participating and delivering their data for their national statistics. As the importance of comparing data of libraries grows, it will also be realized a short exploration of IFLA&#8217;s Library Map of the World.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Existe una creciente necesidad de que las bibliotecas utilicen datos confiables y accesibles para mostrar qué tan bien funcionan y en comparación con otras bibliotecas, ya que hay una reducción constante y cierre de instalaciones en todo el mundo. Un recurso para la evaluación son las estadísticas nacionales. Al investigar en cinco países, comparando 22 bibliotecas públicas y académicas, los investigadores tuvieron dificultades para encontrar indicadores clave de rendimiento en las estadísticas nacionales. Por lo tanto, comenzó otro proyecto de investigación que compara indicadores seleccionados de estas cinco estadísticas nacionales, describe los indicadores, compara su calidad y analiza qué indicadores faltan en algunos países. También se analizan otros aspectos: qué preguntas no pueden responder las estadísticas nacionales, pero qué significa que no todas las bibliotecas participan y entregan sus datos para su estadística nacional. A medida que crece la importancia de comparar los datos de las bibliotecas, también se realizará una breve exploración del Mapa de Bibliotecas del Mundo de la IFLA.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Library Data]]></kwd>
<kwd lng="en"><![CDATA[National Library Statistics]]></kwd>
<kwd lng="en"><![CDATA[Finland]]></kwd>
<kwd lng="en"><![CDATA[Germany]]></kwd>
<kwd lng="en"><![CDATA[Norway]]></kwd>
<kwd lng="en"><![CDATA[Romania]]></kwd>
<kwd lng="es"><![CDATA[Datos de la Biblioteca]]></kwd>
<kwd lng="es"><![CDATA[Biblioteca Nacional de Estadística]]></kwd>
<kwd lng="es"><![CDATA[Finlandia]]></kwd>
<kwd lng="es"><![CDATA[Alemania]]></kwd>
<kwd lng="es"><![CDATA[Noruega]]></kwd>
<kwd lng="es"><![CDATA[Rumania]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chiware]]></surname>
<given-names><![CDATA[Elisha]]></given-names>
</name>
<name>
<surname><![CDATA[Becker]]></surname>
<given-names><![CDATA[Deborah]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The uptake and usage of a national higher education libraries statistics database in South Africa]]></article-title>
<source><![CDATA[South African Journal of Library and Information Science]]></source>
<year>2015</year>
<volume>81</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-7</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Döring]]></surname>
<given-names><![CDATA[Nicola]]></given-names>
</name>
<name>
<surname><![CDATA[Bortz]]></surname>
<given-names><![CDATA[Jürgen]]></given-names>
</name>
</person-group>
<source><![CDATA[Forschungsmethoden und Evaluation in den Sozial- und Humanwissenschaften]]></source>
<year>2016</year>
<edition>5</edition>
<publisher-loc><![CDATA[Berlin Heidelberg ]]></publisher-loc>
<publisher-name><![CDATA[Springer-Verlag]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Düren]]></surname>
<given-names><![CDATA[Petra]]></given-names>
</name>
<name>
<surname><![CDATA[Goldstein]]></surname>
<given-names><![CDATA[Stephane]]></given-names>
</name>
<name>
<surname><![CDATA[Landøy]]></surname>
<given-names><![CDATA[Ane]]></given-names>
</name>
<name>
<surname><![CDATA[Repanovici]]></surname>
<given-names><![CDATA[Angela]]></given-names>
</name>
<name>
<surname><![CDATA[Saarti]]></surname>
<given-names><![CDATA[Jarmo]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of the New Public Management (NPM) and austerity in European public and academic libraries]]></article-title>
<source><![CDATA[Journal of Library Administration]]></source>
<year>2019</year>
<volume>59</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>342-57</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Düren]]></surname>
<given-names><![CDATA[Petra]]></given-names>
</name>
<name>
<surname><![CDATA[Laitinen]]></surname>
<given-names><![CDATA[Markku Antero]]></given-names>
</name>
<name>
<surname><![CDATA[Landøy]]></surname>
<given-names><![CDATA[Ane]]></given-names>
</name>
<name>
<surname><![CDATA[Repanovici]]></surname>
<given-names><![CDATA[Angela]]></given-names>
</name>
</person-group>
<source><![CDATA[Experiences using national statistics while doing research in 22 libraries in five countries]]></source>
<year>2019</year>
<conf-name><![CDATA[ 11Qualitative and Quantitative Methods in Libraries - QQML 2019]]></conf-name>
<conf-date>May 28-31, 2019</conf-date>
<conf-loc>Florence, Italy </conf-loc>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Düren]]></surname>
<given-names><![CDATA[Petra]]></given-names>
</name>
<name>
<surname><![CDATA[Laitinen]]></surname>
<given-names><![CDATA[Markku Antero]]></given-names>
</name>
<name>
<surname><![CDATA[Landøy]]></surname>
<given-names><![CDATA[Ane]]></given-names>
</name>
<name>
<surname><![CDATA[Repanovici]]></surname>
<given-names><![CDATA[Angela]]></given-names>
</name>
</person-group>
<source><![CDATA[Experiences using national statistics while doing research in 22 libraries in five countries]]></source>
<year>2019</year>
<conf-name><![CDATA[ Book of Abstracts of the 11th Qualitative and Quantitative Methods in Libraries-QQML 2019 International Conference]]></conf-name>
<conf-loc>Italy </conf-loc>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dzhigo]]></surname>
<given-names><![CDATA[Alexander]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Library Statistics: The Russian National Standard]]></article-title>
<source><![CDATA[Slavic &amp; East European Information Resources]]></source>
<year>2015</year>
<volume>16</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>141-8</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ellis]]></surname>
<given-names><![CDATA[Simon]]></given-names>
</name>
<name>
<surname><![CDATA[Heaney]]></surname>
<given-names><![CDATA[Michael]]></given-names>
</name>
<name>
<surname><![CDATA[Meunier]]></surname>
<given-names><![CDATA[Pierre]]></given-names>
</name>
<name>
<surname><![CDATA[Poll]]></surname>
<given-names><![CDATA[Roswitha]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Global Library Statistics]]></article-title>
<source><![CDATA[IFLA Journal]]></source>
<year>2009</year>
<volume>35</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>123-30</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Heaney]]></surname>
<given-names><![CDATA[Michael]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Global Library Statistics for the Twenty-First Century]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Heaney]]></surname>
<given-names><![CDATA[Michael]]></given-names>
</name>
</person-group>
<source><![CDATA[Library Statistics for the Twenty-First Century World: Proceedings of the conference held in Montréal on 18-19 August 2008 reporting on the Global Library Statistics Project]]></source>
<year>2009</year>
<page-range>22-6</page-range><publisher-loc><![CDATA[Den Hague, Netherlands ]]></publisher-loc>
<publisher-name><![CDATA[IFLA Publications]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="">
<collab>Hochschulbibliothekszentrum des Landes Nordrhein-Westfalen</collab>
<source><![CDATA[Bibliotheksstatistik]]></source>
<year>2019</year>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="">
<collab>International Federation of Library Associations</collab>
<source><![CDATA[Library Map of the World]]></source>
<year>2019</year>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<collab>International Organization for Standardization</collab>
<source><![CDATA[Information and documentation - International library statistics]]></source>
<year>2013</year>
<edition>5</edition>
<publisher-loc><![CDATA[Geneva ]]></publisher-loc>
<publisher-name><![CDATA[ISO]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<collab>ISO</collab>
<source><![CDATA[Information and documentation - Library performance indicators]]></source>
<year>2014</year>
<edition>3</edition>
<publisher-loc><![CDATA[Geneva ]]></publisher-loc>
<publisher-name><![CDATA[ISO]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<collab>ISO</collab>
<source><![CDATA[Information and documentation - Methods and procedures for assessing the impact of libraries]]></source>
<year>2014</year>
<publisher-loc><![CDATA[Geneva ]]></publisher-loc>
<publisher-name><![CDATA[ISO]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<collab>ISO</collab>
<source><![CDATA[Information and documentation - Quality assessment for national libraries]]></source>
<year>2019</year>
<publisher-loc><![CDATA[Geneva ]]></publisher-loc>
<publisher-name><![CDATA[ISO]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jilovsky]]></surname>
<given-names><![CDATA[Cathie]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Singing in harmony: statistical benchmarking for academic libraries]]></article-title>
<source><![CDATA[Library Management]]></source>
<year>2011</year>
<volume>32</volume>
<numero>1-2</numero>
<issue>1-2</issue>
<page-range>48-61</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Laitinen]]></surname>
<given-names><![CDATA[Markku Antero]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Net Promoter Score as Indicator of Library Customers&#8217; Perception]]></article-title>
<source><![CDATA[Journal of Library Administration]]></source>
<year>2018</year>
<volume>58</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>394-406</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Laitinen]]></surname>
<given-names><![CDATA[Markku Antero]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Aspects of measuring the impact of new innovations in Finnish libraries]]></article-title>
<source><![CDATA[Library Management]]></source>
<year>2019</year>
<volume>40</volume>
<numero>3-4</numero>
<issue>3-4</issue>
<page-range>262-71</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Laitinen]]></surname>
<given-names><![CDATA[Markku Antero]]></given-names>
</name>
<name>
<surname><![CDATA[Saarti]]></surname>
<given-names><![CDATA[Jarmo]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A model for a library&#355;management toolbox: Data warehousing as a tool for filtering and analyzing statistical information from multiple sources]]></article-title>
<source><![CDATA[Library Management]]></source>
<year>2012</year>
<volume>33</volume>
<numero>4-5</numero>
<issue>4-5</issue>
<page-range>253-60</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Landøy]]></surname>
<given-names><![CDATA[Ane]]></given-names>
</name>
<name>
<surname><![CDATA[Raade]]></surname>
<given-names><![CDATA[Johanne]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Indicators for benchmarking in Norwegian academic libraries: Testing the usability of national collection data]]></article-title>
<source><![CDATA[Qualitative and Quantitative Methods in Libraries (QQML)]]></source>
<year>2014</year>
<volume>4</volume>
<page-range>811-20</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lau]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Information Literacy Indicators: a Must for Countries]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Heaney]]></surname>
<given-names><![CDATA[Michael]]></given-names>
</name>
</person-group>
<source><![CDATA[Library Statistics for the Twenty-First Century World: Proceedings of the conference held in Montréal on 18-19 August 2008 reporting on the Global Library Statistics Project]]></source>
<year>2009</year>
<publisher-loc><![CDATA[Den Hague, Netherlands ]]></publisher-loc>
<publisher-name><![CDATA[IFLA Publications]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[Yan Quan]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[National public library statistical systems and management: a comparison between the United States and the People&#8217;s Republic of China]]></article-title>
<source><![CDATA[Library Management]]></source>
<year>1997</year>
<volume>18</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>189-95</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[Yan Quan]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The use of statistics in the managerial process by public library directors in China and the USA: a cross&#355;country survey]]></article-title>
<source><![CDATA[Library Management]]></source>
<year>2001</year>
<volume>22</volume>
<numero>4-5</numero>
<issue>4-5</issue>
<page-range>187-94</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mathison]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
</person-group>
<source><![CDATA[Encyclopedia of evaluation]]></source>
<year>2005</year>
<publisher-loc><![CDATA[Thousand Oaks, CA ]]></publisher-loc>
<publisher-name><![CDATA[Sage Publications, Inc.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Melo]]></surname>
<given-names><![CDATA[Luiza Baptista]]></given-names>
</name>
<name>
<surname><![CDATA[Repanovici]]></surname>
<given-names><![CDATA[Angela]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Assessment of Impact and Value in the Academic Libraries: a literature review]]></article-title>
<source><![CDATA[Qualitative and Quantitative Methods in Libraries (QQML)]]></source>
<year>2018</year>
<volume>7</volume>
<page-range>431-40</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Poll]]></surname>
<given-names><![CDATA[Roswitha]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Standardisation of Library Statistics]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Heaney]]></surname>
<given-names><![CDATA[Michael]]></given-names>
</name>
</person-group>
<source><![CDATA[Library Statistics for the Twenty-First Century World: Proceedings of the conference held in Montréal on 18-19 August 2008 reporting on the Global Library Statistics Project]]></source>
<year>2009</year>
<page-range>27-30</page-range><publisher-loc><![CDATA[Den Hague, Netherlands ]]></publisher-loc>
<publisher-name><![CDATA[IFLA Publications]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pors]]></surname>
<given-names><![CDATA[Niels Ole]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Burning platforms and melting icebergs: An exploratory analysis of present strategic challenges and cross-pressures in the public libraries]]></article-title>
<source><![CDATA[Performance Measurement and Metrics]]></source>
<year>2010</year>
<volume>11</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>9-24</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schnell]]></surname>
<given-names><![CDATA[Rainer]]></given-names>
</name>
<name>
<surname><![CDATA[Hill]]></surname>
<given-names><![CDATA[Paul B.]]></given-names>
</name>
<name>
<surname><![CDATA[Esser]]></surname>
<given-names><![CDATA[Elke]]></given-names>
</name>
</person-group>
<source><![CDATA[Methoden der empirischen Sozialforschung]]></source>
<year>2013</year>
<edition>10</edition>
<publisher-loc><![CDATA[München ]]></publisher-loc>
<publisher-name><![CDATA[Oldenbourg Wissenschaftsverlag]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sumsion]]></surname>
<given-names><![CDATA[John]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[University library statistics from LISU]]></article-title>
<source><![CDATA[Library Management]]></source>
<year>1997</year>
<volume>18</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>163-8</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[National Institute of Statistics (Romania)]]></article-title>
<source><![CDATA[Wikipedia]]></source>
<year>2020</year>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
