@TECHREPORT{Gir_Pre_2016,
author = "Giraldo, Martha - Acosta, Zully - Perez, Jeimy - Mendez, Sergio - Clavijo, Camilo",
title = "Precio o calidad",
year = 2016,
institution = "Repositorio Corporación Unificada Nacional de Educación Superior",
url = "https://repositorio.cun.edu.co/handle/cun/2607",
}