@book{1680,
	author = {Popayan Chila, Gerardino and Rojas Matias, Miguel Angel},
	title = {Un Desarrollo Elemental de la Integral de Riemann, Riemannstielt) es Lebesque sin Teoria de la Medida /},
	publisher = {Unillanos,},
	year = {1985.},
	address = {Villavicencio :}
}