1. Abraham RH, Shaw CD (1983) Dynamics. The geometry of behavior. Part 1: Periodic behavior; Part 2: Chaotic behavior; Part 3: Global behavior. The Visual Mathematics Library, Aerial Press. Santa Cruz, Calif.
2. Angelini F, Chillemi S, Frediani D, Petracchi D (1984) Effects of current pulses on the sustained discharge of visual cells of Limulus. Biophys J 45:1185–1190.
3. Arnold VI (1965) Small denominators I, on the mapping of a circle into itself. Transl Am Math Soc (Ser 2) 46:1213–1284.
4. Arnold VI (1980) Chapitre supplémentaire de la théorie des equations différentielles ordinaires. Mir, Moscou.
5. Barbi M, Haydon PG, Holden AV, Winlow W (1984) On the phase-response curves of repetitively active neurones. J Theor Neurobiol 3:15–24.