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http://uasb.edu.ec/bitstream/10644/2623/1/T0400-MBA-Landeta-La%20oferta.pdf
http://bibdigital.epn.edu.ec/bitstream/15000/1356/1/CD-2095.pdf
http://www.dspace.espol.edu.ec/bitstream/123456789/618/1/1152.pdf