@book{21677,
	author = {Roncallo Rodríguez, Gabriel Eduardo and Gutierrez Camelo, Yunnguer},
	title = {Área Restringida :},
	publisher = {Corporación Unificada Nacional de Educación Superior,},
	year = {2003.},
	address = {Bogotá (Colombia) :},
	edition = {                   }
}