1. A. Einstein, Sitzungsber. Preuss., Akad. Wiss., Bd. 1, 42 (1918).
2. I. Iben, Jr. and A. Tutukov, Astrophys. J. 284, 719 (2003).
3. J. Taylor and R. Hulse, IAU Circ., No. 270 (1974).
4. B. Abbott, R. Abbott, T. Abbott, M. R. Abernathy, et al., Phys. Rev. Lett. 116, 241102 (2016).
5. A. Masevich and A. Tutukov Stellar Evolution: Theory and Observations (Nauka, Moscow, 1988) [in Russian].