@book{52234,
	author = {Polya, G.},
	title = {Cómo plantear y resolver problemas},
	publisher = {Trillas,},
	year = {1984 (c.1965)},
	series = {Matemáticas},
	address = {México :},
	note = {Trad. de la 2 ed. en inglés de 1956}
}