Lech Polkowski <br/><br/>
Rough sets: mathematical foundations 

 - Berlin  Springer-Verlag  2002 
 - xix. 534p.  index, ill. 
 - Advances in soft computing .
<br/><br/><label>ISBN: </label>978-3-7908-1510-8 
<br/><br/><label>Dewey Class. No.: </label>511.32LEC