HIGHLY COERCIVE FILMS IN THE SYSTEM γFe2O3 - Fe3O4, OBTAINED BY A NEW PYROLYSIS TECHNIC M. Langlet, M. Labeau and J.C. Joubert J. Phys. Colloques, 46 C6 (1985) C6-41-C6-44 DOI: 10.1051/jphyscol:1985606