<?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>S0187-358X2016000100073</article-id>
<article-id pub-id-type="doi">10.1016/j.ibbai.2016.02.004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[¿Se ajustan las ventanas fijas de citación a las velocidades de maduración del impacto de las revistas científicas?]]></article-title>
<article-title xml:lang="en"><![CDATA[Do fixed citation windows match impact maturation rates of scientific journals?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dorta González]]></surname>
<given-names><![CDATA[María Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dorta González]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de La Laguna  ]]></institution>
<addr-line><![CDATA[Tenerife ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Las Palmas de Gran Canaria  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<volume>30</volume>
<numero>68</numero>
<fpage>73</fpage>
<lpage>89</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-358X2016000100073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-358X2016000100073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-358X2016000100073&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los distintos campos científicos presentan prácticas de citación diferentes. Por ello, los indicadores bibliométricos basados en citas necesitan ser normalizados para permitir comparaciones entre campos. En este trabajo se analizan más de 600 revistas de ocho categorías JCR . Los resultados obtenidos indican que la velocidad de maduración del impacto varía considerablemente de una categoría a otra. El tiempo transcurrido hasta que la distribución de citas alcanza su máximo oscila entre 2 y 5 años, de ahí que el comienzo y finalización de la ventana de citación tengan un efecto determinante sobre el factor de impacto. Algunas revistas son penalizadas por el factor de impacto a 2 años y favorecidas por el de 5 años, y viceversa. Sin embargo, existen factores de impacto con ventanas variables de citación que producen, en términos generales, medidas de tendencia central más próximas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Scientific fields employ distinct citation practices. As such, bibliometric indicators based on citations need to be standardized to allow comparisons between fields. This paper examines more than six hundred journals in eight JCR categories. Results indicate that impact maturation rates vary considerably from one category to another. The time elapsed until the citation distribution reaches a maximum oscillates between two and five years; hence the opening and closing of the citation window is crucial to the impact factor. Some journals are penalized by the two-year impact factor and benefited by the five-year impact factor, and the reverse situation was also found. Nonetheless, there are impact factors of variable citation windows that produce closer measures of central tendency.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Journals Assessment]]></kwd>
<kwd lng="en"><![CDATA[Bibliometric Indicator]]></kwd>
<kwd lng="en"><![CDATA[Citations Analysis]]></kwd>
<kwd lng="en"><![CDATA[Journal Impact Factor]]></kwd>
<kwd lng="en"><![CDATA[Citation Window]]></kwd>
<kwd lng="en"><![CDATA[Impact Maturity Time]]></kwd>
<kwd lng="es"><![CDATA[Evaluación de revistas]]></kwd>
<kwd lng="es"><![CDATA[Indicador bibliométrico]]></kwd>
<kwd lng="es"><![CDATA[Análisis de citas]]></kwd>
<kwd lng="es"><![CDATA[Factor de impacto de revistas]]></kwd>
<kwd lng="es"><![CDATA[Ventana de citación]]></kwd>
<kwd lng="es"><![CDATA[Tiempo de maduración del impacto.]]></kwd>
</kwd-group>
</article-meta>
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<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[&#8220;Article impact calculated over arbitrary periods&#8221;]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Frandsen]]></surname>
<given-names><![CDATA[T.F.]]></given-names>
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<name>
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<given-names><![CDATA[R.]]></given-names>
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<source><![CDATA[Journal of the American Society for Information Science and Technology]]></source>
<year>2005</year>
<volume>56</volume>
<page-range>58-62</page-range></nlm-citation>
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