Stanescu, D., Nemery, B., Veriter, C., & Marechal, C. (1981). Pattern of Breathing and Ventilatory Response To Co2 in Subjects Practicing Hatha-yoga. Journal of Applied Physiology, 51(6), 1625-1629. https://hdl.handle.net/2078.5/42276 (Original work published 1981)