@TECHREPORT{Bui_Con_2016,
author = "Buitrago, Camilo - Orjuela, Gredy - Días, Sergio Andrade",
title = "Contratodo-Zettah",
year = 2016,
institution = "Repositorio Corporación Unificada Nacional de Educación Superior",
url = "https://repositorio.cun.edu.co/handle/cun/6848",
}