1. Erzwungene Schwingungen bei Veranderlicher Eigenfrequenz;Duffing,1918
2. On relaxation-oscillations;van der Pol;Philos. Mag. J. Sci.,1926
3. Collection of Short Papers on Radiation Medicine for 1958;Belousov,1959
4. Deterministic nonperiodic flow;Lorenz;J. Atmospheric Sci.,1963
5. An equation for continuous Chaos;Rossler;Phys. Lett.,1976