Wickel, E. E., Welk, G. J., & Eisenmann, J. C. (2006). Concurrent validation of the Bouchard
Diary with an accelerometry-based monitor.Medicine and Science in Sports and Exercise, 38,
373 – 379.
Wilhelm, B., Bittner, E., Hofmann, A., Koerner, A., Peters, T., Lüdtke, H., et al. (2015).
Short-term reproducibility and variability of the pupillographic sleepiness test.American
Journal of Human Biology, 27, 862–866.
Wood, J. W. (1994).Dynamics of Human Reproduction: Biology, Biometry, Demography. New
York: Aldine de Gruyter.
326 L.L. Sievert and D.E. Brown