Spectroscopy of Mn4+ doped gadolinium gallium garnet in high magnetic field A. SUCHOCKI, M. POTEMSKI, A. BRENIER, C. PEDRINI et G. BOULON J. Phys. IV France, 04 C4 (1994) C4-337-C4-340 DOI: 10.1051/jp4:1994480