Zimmerman, H. J. <br/><br/>
Fuzzy set theory : and it's applications .-4th ed .-978-81-8128-519-5 

 - Springer, New Delhi  2001 
 - xxv,514 
<br/><br/><label>ISBN: </label>978-81-8128-519-5 
<br/><br/><label>Dewey Class. No.: </label>511.3 Zim