Reisfield, Renata. <br/><br/>
Lasers and excited states of rare earths   
by Renata Reisfield and Christian K. Jorgensen. 
 - Berlin  Springer-Verlag  1977 
 - viii, 226p. 
<br/><br/><label>ISBN: </label>3540083243 
<br/><br/><label>Dewey Class. No.: </label>535.58  / N771