1. Meerschaut, A., Rouxel, J.: J. Less-Common Met. 39 (1975) 197.
2. Meerschaut, A., Guémas, L., Berger, R., Rouxel, J.: Acta Crystallogr. B 35 (1979) 1750.
3. Meerschaut, A., Guémas, L., Rouxel, J., Monceau, P.: VIth Int. Conf. on Solid Compounds of Transition Elements, Stuttgart 1979; Collected Abstr., p. 109.
4. Karnezos, N., Welsh, L.B., Shafer, M.W.: Phys. Rev. B 11 (1975) 1808.
5. Eppinga, R., Wiegers, G.A.: Proc. Int. Conf. “Layered Materials and Intercalates”, Nijmegen (1979); Physica 99B+C (1980) 121.