1. A. V. Postnikov, M. Neumann, St. Plogmann, Yu. M. Yarmoshenko, A. N. Titov, and A. V. Kuranov, Comput. Mater. Sci. 17(2–4), 450 (2000).
2. A. N. Titov and A. V. Dolgoshein, Fiz. Tverd. Tela (St. Petersburg) 42(3), 425 (2000) [Phys. Solid State 42 (3), 434 (2000)].
3. A. N. Titov, Neorg. Mater. 33(5), 534 (1997) [Inorg. Mater. 33 (5), 447 (1997)].
4. A. N. Titov and A. V. Dolgoshein, Fiz. Tverd. Tela (St. Petersburg) 40(7), 1187 (1998) [Phys. Solid State 40 (7), 1081 (1998)].
5. A. N. Titov and S. G. Titova, Fiz. Tverd. Tela (St. Petersburg) 43(4), 605 (2001) [Phys. Solid State 43 (4), 629 (2001)].