Borg Ulf, Eriksson Ivan, Lyttkens Leif, Sjöstrand Ulf, and Wattwil Magnus. 1979. “A Preliminary Report on Experimental Studies of Continuous Positive-Pressure Ventilation (CPPV) and High-Frequency Positive-Pressure Ventilation (HFPPV)”. Upsala Journal of Medical Sciences 84 (2):109-17. https://doi.org/10.3109/03009737909179146.