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1241Article of journalPublished in 2015Repositorio Repositorio Institucional UPN
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1242Article of journalPor Vera G., CésarPublished in 1980Repositorio Repositorio Institucional UPN
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1243
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1244
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1245
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1246
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1247Article of journalRepositorio Repositorio Universidad Javeriana
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1248
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1249
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1250Published in 2004Repositorio Universidad Nacional de Colombia
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