@book{21443,
	author = {Martínez Betancourth, William Fernando  and Romero Báron, Cesar Augusto},
	title = {Plotterbeta /},
	publisher = {Corporación Unificada Nacional de Educación Superior,},
	year = {2015.},
	address = {Bogotá (Colombia) :},
	edition = {                   }
}