Jahn-Teller effect in V4+ doped Gd3Ga5O12 garnet M. Grinberg, A. Brenier, G. Boulon, C. Pedrini, C. Madej et A. Suchocki J. Phys. I France, 3 9 (1993) 1973-1983 DOI: 10.1051/jp1:1993225