Fuzzy sets :  theory and applications to policy analysis and information systems / 
[edited by] Paul P. Wang and S. K. Chang. 
 - New York :  Plenum Press,  1980. 
 - ix, 413 p. :  ill. ;  26 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0306405571 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fuzzy sets--Congresses.<br/>Policy sciences--Congresses.<br/>Social systems--Congresses.<br/>System analysis--Congresses.