Gellert, W (ed) & others <br/><br/>
The VNR concise encyclopedia of mathematics 

 - Van Nostrand Reinhold Company, New York  1977 
 - 816 
<br/><br/><label>ISBN: </label>0-442-22646-2 
<br/><br/><label>Dewey Class. No.: </label>R510.3 VNR