1. Landolt-Börnstein III/27a, Magnetic Properties of Pnictides and Chalcogenides, ed. by K. Adachi, S. Ogawa (Springer Berlin, 1989), p. 70 and references therein
2. G.P. Felcher, F.A. Smith, D. Bellavance, A. Wold, Phys. Rev. B 9, 3046 (1971)
3. K. Selte, A. Kjekshus, W.A. Jamison, A.F. Andresen, J.E. Engebresen, Acta Chem. Scand. 35, 1042 (1971)
4. H. Ido, J.Appl. Phys. part IIA 3247 (1985)
5. K. Adachi, J. Phys. Soc. Jpn. 16, 2187 (1961)