THEORY OF U CENTERS IN ALKALINE EARTH PLUORIDES USING THE SCF-MSXα METHOD L.E. OLIVEIRA, B. MAFFEO, H.S. BRANDI and M.L. DE SIQUEIRA J. Phys. Colloques, 37 C7 (1976) C7-225-C7-226 DOI: 10.1051/jphyscol:1976753