1. On global action-angle coordinates
2. R.H. Cushman, L.M. Bates, Global Aspects of Classical Integrable Systems, Birkhäuser, Basel, 1997, see Appendix D.
3. R. Cushman, Centrum voor Wiskunde en Informatica Newsletter 1, 4 (1983); see also Chapter IV of R.H. Cushman, L.M. Bates, Global Aspects of Classical Integrable Systems, Birkhäuser, Basel, 1997.
4. R. Cushman, J.C. van der Meer, Lecture Notes in Mathematics, Vol. 1416, Springer, Berlin, 1991, p. 26.
5. R. Cushman, H. Knörrer, Lecture Notes in Mathematics, Vol. 1139, Springer, Berlin, 1985, p. 12.