Aschoff, Jürgen Max Planck Institute for Medical Research, Max Planck Society;
http://onlinelibrary.wiley.com/doi/10.1111/j.0954-6820.1955.tb16303.x/epdf (beliebiger Volltext)
https://dx.doi.org/10.1111/j.0954-6820.1955.tb16303.x (beliebiger Volltext)
Aschoff, J. (1955). Zeitgeber der 24-Stunden-Periodik. Journal of Internal Medicine, 152(S307), 50-52. doi:10.1111/j.0954-6820.1955.tb16303.x.