Borg U., Eriksson I., Lyttkens L., Sjöstrand U., & Wattwil M. (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), 109-117. https://doi.org/10.3109/03009737909179146