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http://tesis.ipn.mx/xmlui/handle/123456789/11778
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http://tesis.ipn.mx/xmlui/handle/123456789/41
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http://tesis.ipn.mx/xmlui/handle/123456789/5311
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http://tesis.ipn.mx/xmlui/handle/123456789/12466
http://tesis.ipn.mx/xmlui/handle/123456789/13961
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http://tesis.ipn.mx/xmlui/handle/123456789/4921
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http://tesis.ipn.mx/xmlui/handle/123456789/11467
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http://tesis.ipn.mx/xmlui/handle/123456789/29406
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http://tesis.ipn.mx/xmlui/handle/123456789/18527
http://tesis.ipn.mx/xmlui/handle/123456789/8716