Avecillas Jara, Alberto SantiagoAndrade Rojas, Fredi MarceloMuñoz Guachichullca, Franco Jesús2014-06-272014-06-271994http://dspace.ucuenca.edu.ec/handle/123456789/15670application/pdfspaopenAccesshttp://creativecommons.org/licenses/by-nc-sa/3.0/ec/FisicabachelorThesis