@book{13544,
	author = {Lang, Serge.},
	title = {Calculus of several variables /},
	publisher = {Springer,},
	year = {2012.},
	series = {Undergraduate texts in mathematics.},
	address = {[S.l.] :},
	edition = {Softcover reprint of the original 3rd ed. 1987.},
	url = {http://www.amazon.com/exec/obidos/ASIN/1461270014/chopaconline}
}