The Physiological Principle of Minimum Work. I. The Vascular System and the Cost of Blood Volume by Cecil D. Murray (1926, 10.1073/pnas.12.3.207)

Proceedings of the National Academy of Sciences 12, 207–214. Original byline: Cecil D. Murray, Department of Biology, Bryn Mawr College.

Inspected original scanned paper, printed pp. 209–212, equations 1–7: fixed-flow pumping cost, volume maintenance cost, radius optimization and cubic flow-radius law. The concept article supplies the branching consequence and an equal-daughter example.