1. M. D. Starostenkov, M. V. Pagudin, D. V. Starostenkov, and É. V. Kozlov, Izv. Akad. Nauk, Ser. Fiz. 68, 1510 (2004).
2. G. A. Malygin, Fiz. Tverd. Tela (St. Petersburg) 44(11), 1979 (2002) [Phys. Solid State 44 (11), 2072 (2002)].
3. G. A. Malygin, Fiz. Tverd. Tela (St. Petersburg) 46(11), 1968 (2004) [Phys. Solid State 44 (11), 2035 (2004)].
4. N. A. Koneva and É. V. Kozlov, Izv. Vyssh. Uchebn. Zaved., Fiz. 33, 89 (1990).
5. V. M. Arzhavitin and V. F. Korshak, Fiz. Met. Metalloved. 97(1), 96 (2004) [Phys. Met. Metallogr. 97 (1), 89 (2004)].