R.H. Cushman and L.M. Bates, Global aspects of classical integrable systems, Birkhäuser, Basel, 1997
R. Cushman, “Adjoint orbits in the odd symplectic group”, Regular and Chaotic Dynamics, 12:6 (2007), 746–755
H.W. Broer, R. Cushman, F. Fasso, F. Takens, “Geometry of KAM tori for nearly integrable Hamiltonian systems”, Ergodic Theory and Dynamical Systems, 27:3 (2007), 725–741
R. Cushman and W. van der Kallen, “Adjoint and coadjoint orbits of the Poincaré group”, Acta Appl. Math., 90:1-2 (2006), 65–89
K. Efstathiou, R. Cushman, D.A. Sadovskii, “Fractional monodromy in the 1:(-2) resonance”, Advances in Mathematics, 209:1 (2007), 241–273