Andrey V. Tsiganov, Vitaly A. Khudobakhshov, “Integrable Systems on the Sphere Associated with Genus Three Algebraic Curves”, Regul. Chaotic Dyn., 16:3 (2011), 396–414
A V Tsiganov, “On natural Poisson bivectors on the sphere”, J. Phys. A: Math. Theor., 44:10 (2011), 105203
A. V. Vershilov, “On the bi-Hamiltonian structure of Bogoyavlensky system on $so(4)$”, Regul. Chaotic Dyn., 15:6 (2010), 670–676