@book{7874,
	author = {Gentile, Enzo R. and Chesneau, Eva V,},
	title = {Estructuras Algebraicas I /},
	publisher = {Organización de los Estados Americanos,},
	year = {1977.},
	series = {Matemáticas. Monografía Nº3},
	address = {Washington :},
	edition = {3.}
}