2 citations to https://www.mathnet.ru/eng/acme2

1. V. V. Kozlov, “On the integrability of the equations of dynamics in a non-potential force field”, Russian Math. Surveys, 77:6 (2022), 1087–1106            
2. Valery V. Kozlov, “Integrals of Circulatory Systems Which are Quadratic in Momenta”, Regul. Chaotic Dyn., 26:6 (2021), 647–657