Aschoff, Jürgen Max Planck Institute for Medical Research, Max Planck Society;
http://link.springer.com/content/pdf/10.1007%2FBF02335158.pdf (Any fulltext)
https://dx.doi.org/10.1007/BF02335158 (Any fulltext)
Aschoff, J. (1957). Durchblutungsmessungen am Menschen. Pflügers Archiv: European Journal of Physiology, 266(1), 33-34. doi:10.1007/BF02335158.