1. Mitani T, Koda T. Proceedings of the 12th Int. Conf. Phys. Semiconductors, Stuttgart, Teubner publ. 1974; p. 889
2. Wachter P, Kamba S, Grioni M. Physica B. 1998;252:178
3. Wachter P: In: Gschneidner jr. KA, Eyring L, Lander GH, Chopin GR. Editors. Handbook on the Physics and Chemistry of Rare Earths, 19 Lanthanides/Actinides: Physics II. 1991. p. 177
4. Boppart H, Wachter P. Proceedings of Material Research Society. 1984;22:341
5. Neuenschwander J, Wachter P. Physical Review B. 1990;41:12693