Baker, George A.. <br/><br/>
Encyclopedia of Mathematics and its Applications Vol-14 /  

 - First Ed. /  
 - London :   Addison-Wesley Publishing Company. 
 - p.215,xii :  
<br/><br/><label>ISBN: </label>0-201-13513-2 
<br/><br/><label>Dewey Class. No.: </label>BObc  / M1.2