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CIEX Journ@l, No 9 (5) (2019), April-September 2020, is a biannually published edition by CIEX S.C. Pedro Ascencio 12, Centro, Chilpancingo, Guerrero, México. C. P. 39000, Tel. 7474947973, journal.ciex.edu.mx, Editor: Dra. María del Carmen Castillo Salazar, journal@ciex.edu.mx. Right to exclusive use 04-2016-081814195600-203, ISSN: 2395-9517, by Instituto Nacional de Derechos de Autor. Responsible for the last updating: Editorial Coordination of CIEX S.C, Hugo Enrique Mayo Castrejón, MA. Pedro Ascencio, 12, Centro, Chilpancingo, Guerrero, México. C. P. 39000. Updated: April, 2020.

The opinions expressed by the authors do not imply the expression of any opinion whatsoever on the part of CIEX Journal.

This document may be reproduced in whole or in part provided that all extracts quoted are reproduced verbatim without adaptation and the source and date are stated.

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