1. and , Foundations of Mechanics, 2nd ed., Benjamin/Cummings, 1978.
2. and , Ergodic Problems of Classical Mechanics, Benjamin, 1968, in particular Appendix 26. Also:
3. Les Méthodes Mathématiques de la Mécanique Classique, Editions MIR, Moscou, 1976 (translation of the Russian 1974 edition), pp. 49–50.
4. Lectures on Algebraic Topology, Benjamin, 1967.
5. Lectures on Riemann Surfaces, Princeton University Press, 1966.