@book{204995,
	author = {Willatzen, Morten. and Lew Yan Voon, Lok C.},
	title = {Separable boundary-value problems in physics /},
	publisher = {Wiley-VCH Verlag,},
	year = {©2011.},
	address = {Weinheim :},
	url = {http://onlinelibrary.wiley.com/book/10.1002/9783527634927}
}