SUCCESSIVE REORIENTATIONS OF IRON MOMENTS IN YbFeO3, TbFeO3 AND ErFeO3 M. BELAKHOVSKY, J. CHAPPERT, T. ROUSOKOV and J. SIVARDIÈRE J. Phys. Colloques, 32 C1 (1971) C1-492-C1-493 DOI: 10.1051/jphyscol:19711162