Introduction to the theory of fuzzy subsets 
A.Kaufmann 
 - San Francisco  Academic press  1975 
 - (v.1-Fundamental theoretical elements) 
<br/><br/><label>ISBN: </label>0-12-402301-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>511.3  / KAU