2 citations to https://www.mathnet.ru/rus/forum1

1. V. G. Bardakov, O. V. Bryukhanov, M. V. Neshchadim, “On residual nilpotence of group extensions”, Int. J. Algebra Comput., 33:08 (2023), 1617  
2. Valeriy G. Bardakov, Neha Nanda, Mikhail V. Neshchadim, “On the lower central series of some virtual knot groups”, J. Knot Theory Ramifications, 29:09 (2020), 2050065