@book{5380,
	author = {Clarke, Frank H. and ebrary, Inc.},
	title = {Nonsmooth analysis and control theory},
	publisher = {Springer,},
	year = {c1998.},
	series = {Graduate texts in mathematics ;},
	address = {New York :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10002192}
}