@book{36722,
	author = {Oprea, John. and ebrary, Inc.},
	title = {Differential geometry and its applications},
	publisher = {Mathematical Association of America,},
	year = {c2007.},
	series = {Classroom resource materials},
	address = {Washington, D.C. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10733074}
}