@book{3070,
	author = {Lang Serge},
	title = {Fundamentals Of Differential Geometry},
	publisher = {Springer Verlag PVT. LTD},
	year = {2012.},
	address = {New York},
	url = {http://www.amazon.com/exec/obidos/ASIN/8184896719/chopaconline-20}
}