Integrable Hamiltonian systems on Lie groups: Kowalewski type. Jurdjevic, V. (1999) Annals of Mathematics. Second Series
Invariant varieties of periodic points for the discrete Euler top. Saito, Satoru, Saitoh, Noriko (2006) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Isomorphism and Hamilton representation of some nonholonomic systems. Borisov, A.V., Mamaev, I.S. (2007) Sibirskij Matematicheskij Zhurnal