1. Circadian rhythm of responsiveness in the visual system of the crayfish;Aréchiga,1973
2. Exogenous and endogenous components in circadian rhythms;Aschoff,1960
3. Adaptive functions of eircadian rhythms;Cloudsley-Thompson,1960
4. Synchronization and ranges of entrainment;Enright,1965
5. Methodology;Enright,1981