1. Conditional proof of the Boltzmann-Sinai ergodic hypothesis
2. A. N. Kolmogorov, in Proceedings of the International Congress of Mathematicians (Amsterdam, 1954), Vol. 1, p. 315; English translation reprinted as an Appendix in R. H. Abraham and J. E. Marsden, Foundations of Mechanics (Benjamin/Cummings, 1978), p. 741.
3. Kolmogorov’s 1954 paper on nearly-integrable Hamiltonian systems