@book{272023,
	author = {Collongues, R. and Hackspill, L.},
	title = {Rubidium, cèsium, francium. Gènèralitès, cuivre, argent, or},
	publisher = {Masson et Cie.},
	year = {1957},
	series = {Nouveau Traité de Chimie Minérale},
	address = {París}
}