Evaluation of circadian dyschronism during transmeridian flights
pp. 523-532
in: Fraser, Francis C. Haber, Gert H. Müller (eds), The study of time, Berlin, Springer, 1972Abstract
The most powerful synchronizer for animals seems to be the alternation of light and darkness; for man, under ordinary conditions, this role is probably played by the routine of the society in which he lives.