1. V. P. Zhuze and A. I. Shelykh, Fiz. Tekh. Poluprovodn. Leningrad) 23, 393 (1989) [Sov. Phys. Semicond. 23, 245 (1989)].
2. S. Methfessel and D. C. Hattis, in Handbuch der Physik, Band XVIII/1: Magnetism, Ed. by H. P. J. Wijn (Springer-Verlag, New York, 1968), p. 517.
3. R. Dagis, G. Babonas, and G. Pukinskas, Litov. Fiz. Sb. 28, 559 (1988).
4. Yu.-G. Babonas, R. Dagis, and G. Pukinskas, Opt. Spektrosk. 68, 824 (1990) [Opt. Spectrosc. 68, 481 (1990)].
5. G. Babonas, R. Dagys, and G. Pukinskas, Fiz. Tverd. Tela (Leningrad) 30, 3460 (1988) [Sov. Phys. Solid State 30, 1985 (1988)].