MÖSSBAUER STUDIES OF Fe3-xMgxO4 : APPEARANCE OF VERWEY TRANSITION J.L. Dormann, T. Merceron, P. Renaudin et V.A.M. Brabers J. Phys. Colloques, 41 C1 (1980) C1-177-C1-178 DOI: 10.1051/jphyscol:1980150