@book{20387,
	author = {Zebrowski, Claude and Quantin, Paúl.},
	title = {Suelos volcánicos endurecidos :},
	publisher = {Universidad Central del Ecuador, },
	year = {1997},
	address = {Quito, Ecuador : },
	edition = {Primera edición},
	note = {Incluye índice.}
}