Handbook of non-invasive methods on the skin.

Edited by Jørgen Serup, Gregor B.E. Jemec, Gary L. Grove. Kap. 84, p. 723 - 731 The heat Wash-In and Heat Wash-out Technique for Quantitative, Non-Invasive Measurement of Cutaneous Blood Flow Rate 
By: Per Sejrsen and Mette Midttun