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• https://repositorio.uisek.edu.ec/handle/123456789/243
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• https://repositorio.uisek.edu.ec/handle/123456789/1117
• https://repositorio.uisek.edu.ec/handle/123456789/3416
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• https://repositorio.uisek.edu.ec/handle/123456789/3136
• https://repositorio.uisek.edu.ec/handle/123456789/1977
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• https://repositorio.uisek.edu.ec/handle/123456789/271
• https://repositorio.uisek.edu.ec/handle/123456789/2935
• https://repositorio.uisek.edu.ec/handle/123456789/3732