@book{213200,
	author = {Wansing, H. and ebrary, Inc.},
	title = {Negation},
	publisher = {W. de Gruyter,},
	year = {1996.},
	series = {Perspectives in analytical philosophy =},
	address = {Berlin ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10598170}
}