Grayson, Martin. <br/><br/>
Encyclopedia of Chemical Technology Vol-20 /  

 - Third Ed. /  
 - New York :   John Wiley & Sons. 
 - p.981 :  
<br/><br/><label>ISBN: </label>0-471-02073-7 
<br/><br/><label>Dewey Class. No.: </label>E:(F)k  / L8.20