1. A. Ya. Shik, Fiz. Tekh. Poluprovodn. (St. Petersburg) 26, 1161 (1992) [Sov. Phys. Semicond. 26, 649 (1992)].
2. E. F. Schubert, Delta Doping of Semiconductors (Cambridge Univ. Press, Cambridge, 1996).
3. S. Arscott, M. Missous, and L. Dobaczewski, Semicond. Sci. Technol. 7, 620 (1992).
4. A. G. de Oliveira, G. M. Ribeiro, D. A. W. Soares, et al., J. Appl. Phys. 78, 2659 (1995).
5. V. V. Valyaev, V. L. Gurtovoĭ, D. Yu. Ivanov, et al., Zh. Éksp. Teor. Fiz. 113, 693 (1998) [JETP 86, 383 (1998)].