1. B. P. Zakharchenya and F. Maier [Eds.] Optical Orientation [in Russian], Nauka, Leningrad, 1989.
2. C. Weisbuch, Semicond. Semimet. 24, 1 (1988).
3. J. K. Furdyna and J. Kossut [Eds.], Diluted Magnetic Semiconductors, Vol. 25 of Semiconductors and Semimetals, edited by R. K. Willardson and A. C. Beer, Academic Press, New York, 1988.
4. D. R. Yakovlev, W. Ossau, G. Landwehr et al., Solid State Commun. 82, 29 (1992).
5. X. Liu, A. Petrou, J. Warnock et al., Phys. Rev. Lett. 63, 2280 (1989).