@article {,
	title = {The Chivay obsidian source and the geological origin of Titicaca Basin type obsidian artifacts},
	journal = {Andean Past},
	volume = {5},
	year = {1998},
	pages = {203-223},
	keywords = {obsidian western slope andes archaeology},
	author = {Richard L. Burger and Asaro, Frank and Salas, Guido and Stross, Fred}
}