Handbook on the physics and chemistry of rare earths  V.20 
ed. by Karl A. Gaschneider, LeRoy Eyring 
 - Amsterdam  Elsevier  1995 
 - xiv, 464p. 
<br/><br/><label>ISBN: </label>0444820140 
<br/><br/><label>Dewey Class. No.: </label>546.410202  / N78.20 "R"