@book{9316,
	author = {Orton, Anthony and Solana, Guillermo},
	title = {Didáctica de las matemáticas},
	publisher = {Ediciones Morata},
	year = {1990},
	series = {Educación infantil y primaria},
	address = {Madrid},
	note = {Indice de materias: p. 217-219}
}