1. Splitting of locomotor circadian rhythmicity in hamsters is facilitated by pinealectomy
2. Armstrong Sm (1991a) Entrainment of vertebrate circadian rhythms by melatonin. In Advances in Pineal Research, A Foldes and RJ Reiter, eds, vol 5, pp 259-266, J. Libbey, London.
3. Armstrong Sm (1991b) Treatment of sleep disorders by melatonin administration . In Advances in Pineal Research, A Foldes and RJ Reiter, eds, vol 6, pp 263-274, J. Libbey, London.
4. Armstrong Sm, Thomas Emv, and Chesworth Mj (1989) Melatonin induced phase-shifts of rat circadian rhythms. In Advances in Pineal Research, D Evered and S Clark, eds, pp 188-207, Pittman, London.
5. Circadian Rhythms: Influences of Internal and External Factors on the Period Measured in Constant Conditions1