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5 de Mayo No. 304, Centro Loreto, Zacatecas, México. C.P. 98830
Tel. (722)2183084
www.cusxxi.edu.mx, dperspectivas@cus21.edu.mx
Copyright to the exclusive use No.04-2014-031810000800-203
ISSN-e: 2448-6566

Responsible editor: Eduardo Pérez Archundia Editing done by the Departamento Editorial, Campus Universitario Siglo XXI. Calzada de Barbabosa No. 150, San Antonio Buenavista, Zinacantepec, C.P. 51350. Tel.: 722 318 3008

The opinions expressed by the authors do not necessarily reflect the position of the journal. The reproduction and use of the materials is authorized making use of the source.