IMPROVEMENT OF HEXAFERRITES CRYSTAL GROWTH : REPRODUCTIBILITY AND CHARACTERIZATION J.M. Desvignes, H. Le Gall, M. Labeyrie, J.C. Mage and T.M. Robinson J. Phys. Colloques, 46 C6 (1985) C6-331-C6-334 DOI: 10.1051/jphyscol:1985660