RADIATION DEFECT AND 3d IMPURITY ABSORPTION IN MgF2 AND KMgF3 CRYSTALS W. A. SIBLEY, S. I. YUN et L. N. FEUERHELM J. Phys. Colloques, 34 C9 (1973) C9-503-C9-506 DOI: 10.1051/jphyscol:1973984