@book{6587,
	author = {Yanheng, Ding. and ebrary, Inc.},
	title = {Variational methods for strongly indefinite problems},
	publisher = {World Scientific,},
	year = {c2007.},
	series = {Interdisciplinary mathematical sciences ;},
	address = {Singapore ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10699059}
}