Zimmermann, H.J.. Fuzzy Set Theory: And its Applications / Textual Documents H.J.Zimmermann. - 1st ed. / - Bombay : Allied Publishers Ltd. , C1991. - xix,399p. : ill ; 22cm . Index ISBN: 81-7023-525-1 Subjects--Index Terms: Mathematics Set Theory G-Mathematics Dewey Class. No.: 510 / Zi 65 Fu