1. Aschoff J., Pfleugers Arch.270(9), (1959).
2. Campbell S. S., Dawson W. A., Zulley J., Sleep16(638), (1993).
3. Aschoff J., Cold Spring Harbor Symp. Quant. Biol.25(11), (1960).
4. Aschoff J., Pfluegers Arch.270(9), (1959).
5. Wever R., in Biological Rhythms: Handbook of Behavioral Neurobiology, , Aschoff J., Ed (Plenum, New York, 1981), p. 311.