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

 - Boca Raton   Chapman and Hall      1999 
 - 1969p.  cm. 
<br/><br/><label>Standard No.: </label>37457 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>Bk, N9      RR