<?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>2007-1558</journal-id>
<journal-title><![CDATA[International Journal of Combinatorial Optimization Problems and Informatics]]></journal-title>
<abbrev-journal-title><![CDATA[International J. of Combinatorial Optim. Problems and Informatics]]></abbrev-journal-title>
<issn>2007-1558</issn>
<publisher>
<publisher-name><![CDATA[EDITADA (EDITorial Academica Dragon Azteca, S. de R.L. de C.V. or Aztec Dragon Academic Publishing)]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-15582015000200028</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Semantic representations for knowledge modelling of a Natural Language Interface to Databases using ontologies]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Juan J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Florencia]]></surname>
<given-names><![CDATA[Rogelio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fraire]]></surname>
<given-names><![CDATA[Héctor J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pazos]]></surname>
<given-names><![CDATA[Rodolfo A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Reyes]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Ciudad Madero  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2015</year>
</pub-date>
<volume>6</volume>
<numero>2</numero>
<fpage>28</fpage>
<lpage>42</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-15582015000200028&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-15582015000200028&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-15582015000200028&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Despite the large number of Natural Language Interfaces to Databases (NLIDB) that have been implemented, they do not guarantee to provide a correct response in 100% of the queries. In this paper, we present a way of semantic modelling the elements that integrate the knowledge of a NLIDB with the aim of increasing the number of correctly-answered queries. We design semantic representations in order to: a) model any relational database schema and its relationship with the natural language and b) add metadata to natural language words to enable our NLIDB to interpret natural language queries that contain superlatives. We configured our NLIDB in a relational database that we migrated from Geobase and used the Geoquery250 corpus to evaluate its performance. We compare its performance with the interfaces ELF, Freya and NLP-Reduce. The results indicate that our proposal allowed our NLIDB to obtain the best performance.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Natural Language Interface to Databases]]></kwd>
<kwd lng="en"><![CDATA[Semantic Representations]]></kwd>
<kwd lng="en"><![CDATA[Knowledge]]></kwd>
<kwd lng="en"><![CDATA[Ontology]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chandra]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[Natural Language Interfaces to Databases]]></source>
<year>2006</year>
<publisher-name><![CDATA[University of North Texas]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Natural language interfaces to databases - An introduction]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Androutsopoulos]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Ritchie]]></surname>
<given-names><![CDATA[G.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Thanish]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Natural Language Engineering]]></source>
<year>1995</year>
<volume>1</volume>
<page-range>29-81</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Natural language interface to database using semantic matching]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nihalani]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Motwani]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Silaka]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[International Journal of Computer Applications]]></source>
<year>2011</year>
<volume>31</volume>
<page-range>29-34</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Learning to parse database queries using inductive logic programming]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zelle]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Mooney]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the Thirteenth National Conference on Artificial Intelligence]]></source>
<year>1996</year>
<volume>2</volume>
<page-range>1050-5</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Using multiple clause constructors in inductive logic programming for semantic parsing]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tang]]></surname>
<given-names><![CDATA[L.R.]]></given-names>
</name>
<name>
<surname><![CDATA[Mooney]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Machine Learning: ECML 2001, Lecture Notes in Computer Science]]></source>
<year>2001</year>
<volume>2167</volume>
<page-range>466-77</page-range><publisher-loc><![CDATA[Heidelberg ]]></publisher-loc>
<publisher-name><![CDATA[Springer Berlin]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Woods]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Kaplan]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Webber]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Lunar Sciences Natural Language Information System]]></source>
<year>1972</year>
<publisher-loc><![CDATA[Cambridge, Massachusetts ]]></publisher-loc>
<publisher-name><![CDATA[Bolt Beranek and Newman Inc.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Seven Steps to Rendezvous with the Casual User]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Codd]]></surname>
<given-names><![CDATA[E.F.]]></given-names>
</name>
</person-group>
<source><![CDATA[IFIP Working Conference Data Base Management]]></source>
<year>1974</year>
<page-range>179-200</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Developing a Natural Language Interface to Complex Data]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hendrix]]></surname>
<given-names><![CDATA[G.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Sacerdoti]]></surname>
<given-names><![CDATA[E.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Sagalowicz]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Slocum]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[ACM Transactions on Database Systems]]></source>
<year>1978</year>
<volume>3</volume>
<page-range>105-47</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Efficient processing of interactive relational database queries expressed in logic]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Warren]]></surname>
<given-names><![CDATA[D.H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the seventh international conference on Very Large Data Bases]]></source>
<year>1981</year>
<volume>7</volume>
<page-range>272-81</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[TEAM: an experiment in the design of transportable natural-language interfaces]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Grosz]]></surname>
<given-names><![CDATA[B.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Appelt]]></surname>
<given-names><![CDATA[D.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Martin]]></surname>
<given-names><![CDATA[P.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Pereira]]></surname>
<given-names><![CDATA[F.C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Artificial Intelligence]]></source>
<year>1987</year>
<volume>32</volume>
<page-range>173-243</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Rapid Porting of the PARLANCE Natural Language Interface]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bates]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the workshop on Speech and Natural Language]]></source>
<year>1989</year>
<page-range>83-8</page-range><publisher-name><![CDATA[Association for Computational Linguistics]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Multiple underlying systems: translating user request into programs to produce answers]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bobrow]]></surname>
<given-names><![CDATA[R.J]]></given-names>
</name>
<name>
<surname><![CDATA[Resnik]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Weischedel]]></surname>
<given-names><![CDATA[R.M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the 28th Annual meeting of ACL]]></source>
<year>1990</year>
<page-range>227-34</page-range><publisher-loc><![CDATA[Pittsburgh ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Natural Language Interfaces to Databases: An Analysis of the State of the Art]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pazos]]></surname>
<given-names><![CDATA[R.A.]]></given-names>
</name>
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[J.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Aguirre]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Fraire]]></surname>
<given-names><![CDATA[H.J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Recent Advances on Hybrid Intelligent Systems]]></source>
<year>2013</year>
<volume>451</volume>
<page-range>463-80</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Using string-kernels for learning semantic parsers]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kate]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Mooney]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the 21st International Conference on Computational Linguistics and 44th Annual Meeting of the Association for Computational Linguistics]]></source>
<year>2006</year>
<page-range>913-20</page-range><publisher-loc><![CDATA[Sydney, Australia ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[A statistical semantic parser that integrates syntax and semantics]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ge]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Mooney]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the Ninth Conference on Computational Natural Language Learning]]></source>
<year>2005</year>
<page-range>9-16</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Learning for semantic parsing with statistical machine translation]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wong]]></surname>
<given-names><![CDATA[Y.W.]]></given-names>
</name>
<name>
<surname><![CDATA[Mooney]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of Human Language Technology Conference / North American Chapter of the Association for Computational Linguistics Annual Meeting]]></source>
<year>2006</year>
<page-range>439-46</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[MASQUE/SQL, An Efficient and Portables Language Query Interface for Relational Databases]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Androutsopoulus]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Ritchie]]></surname>
<given-names><![CDATA[G.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Thanish]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the 6th international conference on Industrial and engineering applications of artificial intelligence and expert systems]]></source>
<year>1993</year>
<page-range>327-30</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Query Formulation from High-Level Concepts for Relational Databases]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Chu]]></surname>
<given-names><![CDATA[W.W.]]></given-names>
</name>
<name>
<surname><![CDATA[Meng]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Kong]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the 1999 User Interfaces to Data Intensive Systems]]></source>
<year>1999</year>
<page-range>64-74</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="">
<collab>ELF software</collab>
<source><![CDATA[Demo Gallery]]></source>
<year>2015</year>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Modern natural language interfaces to databases: Composing statistical parsing with semantic tractability]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Popescu]]></surname>
<given-names><![CDATA[A.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Armanasu]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Etzioni]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Ko]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Yates]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the 20th international conference on Computational Linguistics]]></source>
<year>2004</year>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Damljanovic]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Natural Language Interfaces to Conceptual Models]]></source>
<year>2011</year>
<publisher-name><![CDATA[The University of Sheffield]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Survey on Web Ontology Editing Tools]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Buraga]]></surname>
<given-names><![CDATA[S.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Cojocaru]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Nichifor]]></surname>
<given-names><![CDATA[O.C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Transactions on Automatic Control and Computer Science]]></source>
<year>2006</year>
<page-range>1-6</page-range><publisher-loc><![CDATA[Romania ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Querying the Semantic Web with Ginseng: A Guided Input Natural Language Search Engine]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bernstein]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kaufmann]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Kaiser]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[15th Workshop on Information Technologies and Systems]]></source>
<year>2005</year>
<page-range>112-26</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Porting natural language interfaces between domains: an experimental user study with the ORAKEL system]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cimiano]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Haase]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Heizmann]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proceedings of the 12th international conference on Intelligent User Interfaces]]></source>
<year>2007</year>
<page-range>180-9</page-range><publisher-loc><![CDATA[Honolulu, Hawaii, USA ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kaufmann]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Bernstein]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Fischer]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<source><![CDATA[NLP-Reduce: A "naïve" but Domain-independent Natural Language Interface for Querying Ontologies]]></source>
<year>2007</year>
<conf-name><![CDATA[ 4European Semantic Web Conference]]></conf-name>
<conf-date>2007</conf-date>
<conf-loc>Innsbruck </conf-loc>
<page-range>1-2</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Panto: A portable natural language interface to ontologies]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Xiong]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhou]]></surname>
<given-names><![CDATA[Q.]]></given-names>
</name>
<name>
<surname><![CDATA[Yu]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Semantic Web: Research and Applications]]></source>
<year>2007</year>
<volume>4519</volume>
<page-range>473-87</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Natural Language Interfaces to Ontologies: Combining Syntactic Analysis and Ontology-based Lookup through the User Interaction]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Damljanovic]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Agatonovic]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Cunningham]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Semantic Web: Research and Applications]]></source>
<year>2010</year>
<page-range>106-20</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
