1. V. M. Lipunov, Astrophysics of Neutron Stars [in Russian] (Nauka, Moscow, 1987), p. 280.
2. V. M. Lipunov and N. I. Shakura, Pis'ma Astron. Zh. 2, 343 (1976) [Sov. Astron. Lett. 2, 133 (1976)].
3. K. Davidson and J. P. Ostriker, Astrophys. J. 179, 585 (1973).
4. E. Gullbring, L. Hartmann, C. Briceno, and N. Calvet, Astrophys. J. 492, 323 (1998).
5. S. Miyaji and Y. Tanaka, Physics of Neutron Stars and Black Holes, Ed. by Y. Tanaka (Universal Academy Press, Tokyo, 1988), p. 269.