@book{56309,
	author = {Sz�ekelyhidi, L�aszl�o. and ebrary, Inc.},
	title = {Functional equations on hypergroups},
	publisher = {World Scientific,},
	year = {2013.},
	address = {Singapore :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10622798}
}