Andrey V. Tsiganov, “Reduction of Divisors and the Clebsch System”, Regul. Chaotic Dyn., 27:3 (2022), 307–319
Andrey V. Tsiganov, “New variables of separation for the Steklov–Lyapunov system”, SIGMA, 8 (2012), 012, 14 pp.
Petre Birtea, Ioan Caşu, Tudor S. Ratiu, Murat Turhan, “Stability of Equilibria for the $\mathfrak{so}(4)$ Free Rigid Body”, J Nonlinear Sci, 22:2 (2012), 187
А. В. Цыганов, “Согласованные скобки Ли–Пуассона на алгебрах Ли $e(3)$ и $so(4)$”, ТМФ, 151:1 (2007), 26–43 ; A. V. Tsiganov, “Compatible Lie–Poisson brackets on the Lie algebras $e(3)$ and $so(4)$”, Theoret. and Math. Phys., 151:1 (2007), 459–473