12 citations to https://www.mathnet.ru/eng/dan1601
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G. Haghighatdoost, A. A. Oshemkov, “The topology of Liouville foliation for the Sokolov integrable case on the Lie algebra so(4)”, Sb. Math., 200:6 (2009), 899–921
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Sergei Sakovich, “On a “Mysterious” Case of a Quadratic Hamiltonian”, SIGMA, 2 (2006), 064, 4 pp.