Benz, R. <br/><br/>
Compounds with nitrogen  Th : Thorium : System number 44/ 
R. Benz... 
 - 8. ed. 
 -  1987 
 - XVI, 125 S.  graph. Darst. 
 - D. Brawn .
<br/><br/><label>ISBN: </label>3540935541 0387935541 
<br/><br/><label>Universal Decimal Class. No.: </label>546