Lee, John M., Introduction to Smooth Manifolds, Springer-Verlag, New York (2003)
ISBN0-387-95495-3. Graduate-level textbook on smooth manifolds.
Hwa-Chung, Lee, "The Universal Integral Invariants of Hamiltonian Systems and Application to the Theory of Canonical Transformations", Proceedings of the Royal Society of Edinburgh. Section A. Mathematical and Physical Sciences, 62(03), 237–246. doi:10.1017/s0080454100006646
Lee, John M., Introduction to Smooth Manifolds, Springer-Verlag, New York (2003)
ISBN0-387-95495-3. Graduate-level textbook on smooth manifolds.
Hwa-Chung, Lee, "The Universal Integral Invariants of Hamiltonian Systems and Application to the Theory of Canonical Transformations", Proceedings of the Royal Society of Edinburgh. Section A. Mathematical and Physical Sciences, 62(03), 237–246. doi:10.1017/s0080454100006646