1. J.M. Seoane, M.A.F. Sanjuán, Rep. Prog. Phys. 76, 016001 (2012)
2. E. Ott, T. Tél, Chaos 3, 4 (1993)
3. C. Grebogi, E. Ott, J.A. Yorke, Physica D 7, 181 (1983)
4. T. Tél, B.L. Hao (Ed.), Directions in Chaos, ed. by B.L. Hao, vol. 3 (World Scientific, Singapore, 1990), p. 149; in STATPHYS 19, ed. by B.L. Hao (World Scientific, Singapore, 1996), p.243
5. H.C. Ohanian, Special Relativity: A Modern Introduction (Physics Curriculum & Instruction, Lakeville, 2001)