FLUORESCENCE OF Pr3+ AND Dy3+ IN LaMgAl11O19 SINGLE CRYSTALS B. VIANA, P. DEROUINEAU, J. BARRIE, A.M. LEJUS, B. DUNN, O. STAFSUDD and D. VIVIEN J. Phys. Colloques, 48 C7 (1987) C7-509-C7-511 DOI: 10.1051/jphyscol:19877121