Effects of Variations in Stoichiometry on M-Type Hexaferrites C. Sürig, D. Bonnenberg, K.A. Hempel, P. Karduck, HJ. Klaar and Ch. Sauer J. Phys. IV France, 07 C1 (1997) C1-315-C1-316 DOI: 10.1051/jp4:19971124