Muller, Gert H. <br/><br/>
Sets And Classes 
/by Gert H. Muller 
 - New York:  North-Holland Publishing;  1976. 
 - 358p. 
<br/><br/><label>ISBN: </label>0720422841 
<br/><br/><label>Dewey Class. No.: </label>511.32  / MUL/S