@book{16257,
	author = {Valiente Barderas, Santiago. and Rubio Ramirez, Santiago. Título: Trigonometria.},
	title = {Problemario de trigonometria/},
	publisher = {Limusa  },
	year = {1990.},
	address = {Mexico },
	edition = {1 Ed.},
	note = {S. c.1.}
}