Circulation time: method-1927 by Herrmann L Blumgart and Otto C Yens. Studies on the velocity of blood flow: I. The method utilized. Journal of Clinical Investigation 4:1-13, 1927.
D001783:Blood Flow Velocity; D049673:History, 20th Century; D008722:Methods; D010827:Physiology / Q000266:history*; D014481:United States