2 citations to https://www.mathnet.ru/rus/acme2
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В. В. Козлов, “Об интегрируемости уравнений динамики в непотенциальном силовом поле”, УМН, 77:6 (2022), 137–158 ; 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
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Valery V. Kozlov, “Integrals of Circulatory Systems Which are Quadratic
in Momenta”, Regul. Chaotic Dyn., 26:6 (2021), 647–657