STRESS AND MAGNETO-OPTICAL STUDIES ON TETRAHEDRAL AND TETRAGONAL F CENTRES IN SrCl2 AND BaCIF J. DURAN, D. LEMOYNE, S. LEFRANT et M. YUSTE J. Phys. Colloques, 34 C9 (1973) C9-131-C9-132 DOI: 10.1051/jphyscol:1973924