@book{14828,
	author = {International Conference on Symmetry and Perturbation Theory and Gaeta, Giuseppe, and ebrary, Inc.},
	title = {Symmetry and perturbation theory},
	publisher = {World Scientific,},
	year = {c2007.},
	address = {Singapore :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10255494}
}