LANTHANIDE-MAGNESIUM ALUMINOGALLATES, PROMISING LASER MATERIALS D. LEFEBVRE, J. THERY, D. VIVIEN, B. FERRAND, Y. GRANGE et F. AUZELJ. Phys. Colloques, 48 C7 (1987) C7-467-C7-469DOI: https://doi.org/10.1051/jphyscol:19877111