Misha Bialy, Andrey E Mironov, “Cubic and quartic integrals for geodesic flow on 2-torus via a system of the hydrodynamic type”, Nonlinearity, 24:12 (2011), 3541
G. W. Gibbons, C. Rugina, “Goryachev-Chaplygin, Kovalevskaya, and Brdička-Eardley-Nappi-Witten pp-waves spacetimes with higher rank Stäckel-Killing tensors”, Journal of Mathematical Physics, 52:12 (2011)
А. В. Болсинов, В. В. Козлов, А. Т. Фоменко, “Принцип Мопертюи и геодезические потоки на сфере, возникающие из интегрируемых случаев динамики твердого тела”, УМН, 50:3(303) (1995), 3–32 ; A. V. Bolsinov, V. V. Kozlov, A. T. Fomenko, “The Maupertuis principle and geodesic flows on the sphere arising from integrable cases in the dynamics of a rigid body”, Russian Math. Surveys, 50:3 (1995), 473–501