OPTICAL PROPERTIES OF Eu3+ AND Cr3+ DOPED LaCaZrSiBORATE A. BROWN, A. BRUCE, J.A. CAPOBIANCO, D. KRASHKEVICH et D.J. SIMKIN J. Phys. Colloques, 48 C7 (1987) C7-501-C7-504 DOI: 10.1051/jphyscol:19877119