1. B. P. Abbott et al., (Virgo, LIGO Scientific), Phys. Rev. Lett.116, 061102 (2016).
arXiv:1602.03837
[gr-qc]
2. B. P. Abbott et al., (Virgo, LIGO Scientific), Phys. Rev. Lett.119, 161101 (2017).
arXiv:1710.05832
[gr-qc]
3. N. V. Krasnikov, Theor. Math. Phys. 73, 1184 (1987). [Teor. Mat. Fiz.73,235(1987)]
4. E. T. Tomboulis, (1997).
arXiv:hep-th/9702146
[hep-th]
5. L. Modesto, Phys. Rev. D 86, 044005 (2012).
arXiv:1107.2403
[hep-th]