Increase in skin blood circulation and transcutaneous oxygen partial pressure of the top of the foot in lower leg immersion in water containing carbon dioxide in patients with arterial occlusive disease. Results of a controlled study compared with fresh water].

Hartmann B1, Drews B, Burnus C, Bassenge E
Vasa. 1991;20(4):382-7

https://www.ncbi.nlm.nih.gov/pubmed/1776351