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1Article of journalPublished in 2011Repositorio Repositorio Universidad de Santander
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2Article of journalPublished in 2011Repositorio Repositorio UNAB
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3Article of journalPublished in 2007Repositorio Repositorio UNAB
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4Published in 2008Repositorio Repositorio Institucional USTA
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5Published in 2008Repositorio Universidad Santo Tomás
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6Published in 2008Repositorio Repositorio Institucional USTA
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