Fine Powders of Co-Mn Cation Deficient Spinel Ferrites for Magneto-Optical Pigments L. Bouet, P. Tailhades, M. Durand et A. Rousset J. Phys. IV France, 07 C1 (1997) C1-523-C1-524 DOI: 10.1051/jp4:19971213