2 citations to https://www.mathnet.ru/eng/cqg1

1. G. A. Alekseev, “Collision of strong gravitational and electromagnetic waves in the expanding universe”, Phys. Rev. D, 93:6 (2016), 061501(R) , 6 pp., arXiv: 1511.03335v2      
2. G. A. Alekseev, “Integrable and non-integrable structures in Einstein–Maxwell equations with Abelian isometry group $\mathcal G_2$”, Proc. Steklov Inst. Math., 295 (2016), 1–26