Cr+ and Cr3+ defects in CaF2 and SrF2.  [electronic resource] 

 -  Physical review. B, Condensed matter  Sep 1985 
 - 4158-4163 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0163-1829 
<br/><br/><label>Standard No.: </label>10.1103/physrevb.32.4158  doi