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http://dspace.utb.edu.ec/handle/49000/13358
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http://dspace.utb.edu.ec/handle/49000/13415
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http://dspace.utb.edu.ec/handle/49000/13443
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http://dspace.utb.edu.ec/handle/49000/13356
http://dspace.utb.edu.ec/handle/49000/13385