@article {usgs_silicon_2013,
	title = {Minerals Yearbook, Vol. I, Metals \& Minerals:},
	year = {2013},
	pages = {144},
	publisher = {U.S. Government Printing Office},
	url = {http://minerals.usgs.gov/minerals/pubs/commodity/silicon/mcs-2013-simet.pdf}
}
