E. Kleitman

Resonance of about-weekly human heart rate rhythm with solar activity change.

N. Kleitman, H. Wendt, R. Sothern, 1996, Biologia.

Effect of non-twenty-four-hour routines of living on oral temperature and heart rate.

N. Kleitman, N KLEITMAN, E KLEITMAN, 1953, Journal of applied physiology.

THE POSSIBLE ORIGIN OF THE BIOLOGICAL WEEK INFERRED FROM THE HUMAN HEARTRATE VARIATIONS OVER THE SOLAR ACTIVITY CYCLE

H. Wendt, R. Sothern, E. Haus, 1998 .