FIELD DEPENDENCE OF THE BOUND STATE OF Cr3+ EXCITON ACCOMPANIED WITH Yb3+ SPIN FLIP IN YbCrO3 N. Kojima et I. Tsujikawa J. Phys. Colloques, 49 C8 (1988) C8-897-C8-898 DOI: 10.1051/jphyscol:19888407