57Fe MÖSSBAUER MEASUREMENTS IN HIGH MAGNETIC FIELDS : A STUDY OF MAGNETIC PHASE TRANSITIONS IN FeI2 G. H. Calis et J. M. TroosterJ. Phys. Colloques, 41 C1 (1980) C1-165-C1-166DOI: https://doi.org/10.1051/jphyscol:1980144