1. R. V. Pisarev, Ferroelectrics 162, 191 (1994).
2. V. V. Eremenko, N. F. Kharchenko, Yu. G. Litovchenko, and V. N. Naumenko, Magnetooptics and Spectroscopy of Antiferromagnets (Naukova Dumka, Kiev, 1989).
3. V. N. Krivoruchko and D. A. Yablonskii, Zh. Éksp. Teor. Fiz. 94, 268 (1988) [Sov. Phys. JETP 67, 1886 (1988)].
4. V. N. Krivoruchko, T. N. Solov’eva, and D. A. Yablonskii, Opt. Spektrosk. 68, 942 (1990) [Opt. Spectrosc. 68, 550 (1990)].
5. V. N. Krivoruchko and T. E. Primak, Fiz. Tverd. Tela (Leningrad) 33, 3201 (1991) [Sov. Phys. Solid State 33, 1810 (1991)].