@book{5234,
	author = {Zimmermann, H.-J.},
	title = {Fuzzy set theory--and its applications /},
	publisher = {Kluwer Academic Publishers,},
	year = {c1996.},
	address = {Boston :},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0820/95033315-d.html}
}