1. E. Fermi, J. Pasta and S. Ulam, Studies of nonlinear problems, in E. Fermi: Note e Memorie (Collected Papers), Vol. II, No. 266. 977–988 (Accademia Nazionale dei Lincei, Roma, and The University of Chicago Press, Chicago 1965).
2. D.K. Campbell, P. Rosenau and G. Zaslavsky, Introduction: the Fermi-Pasta-Ulam problem—the first fifty years, Chaos 15, 015101 (2005), and the papers following it.
3. T.P. Weissert, The genesis of simulation in dynamics; pursuing the Fermi-Pasta-Ulam problem. Springer, New York, 1997.
4. N.J. Zabusky and M.D. Kruskal, Interaction of solitons in a collisionless plasma and the recurrence of initial states, Phys. Rev. Lett. 15, 240–243 (1965).
5. F.M. Izrailev and B.V. Chirikov, Statistical properties of a nonlinear string, Sov. Phys. Dokl. 11, 30–34 (1966).