@book{8714,
	author = {Conference on "Mathematics at the Service of Man", Universidad Politechica deLas Palmas, Canary Islands, Spain, June 28-July 3, 1982 and Skala, Heinz J.},
	title = {Aspects of vagueness},
	publisher = {Reidel Publications,},
	year = {1984},
	address = {Dordrecht:}
}