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Source:
http://www.scielo.org.co/pdf/esrj/v12n2/v12n2a04.pdf.
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Authors :
Beatriz L Gómez; The Pennsylvania State University CiteSeerX Archives
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Source:
http://www.life-worldwide.org/assets/uploads/files/Gomez%20review.pdf.
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Source:
http://bibliotecadigital.udea.edu.co/dspace/bitstream/10495/2963/1/Gonzalez_Adriana_2009_alternative_additional_certifications.pdf.
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Source:
http://www.revistalatinacs.org/11SLCS/actas_2011_IIICILCS/071.pdf.
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Authors :
The Pennsylvania State University CiteSeerX Archives
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Source:
http://laccei.org/LACCEI2014-Guayaquil/RefereedPapers/RP096.pdf.
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Authors :
The Pennsylvania State University CiteSeerX Archives
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Source:
http://www.sefh.es/fh/2007/n3/5i.pdf.
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Source:
http://caeti.uai.edu.ar/archivos/200_paper_cacic_pescepons_-_2004.pdf.
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