Weisstein, Eric W. <br/><br/>
CRC concise encyclopedia of Mathematics 

 - Boca Raton  CRC Press  1998 
 - 1969p.  26 cm. 
<br/><br/><label>ISBN: </label>0849396409 
<br/><br/><label>Dewey Class. No.: </label>510.3,D,wei  / _