Fritts H W, Cournand A
DEPARTMENT OF MEDICINE, COLLEGE OF PHYSICIANS AND SURGEONS, COLUMBIA UNIVERSITY, AND CARDIO-PULMONARY LABORATORY (COLUMBIA UNIVERSITY DIVISION), BELLEVUE HOSPITAL, NEW YORK.
Proc Natl Acad Sci U S A. 1958 Oct 15;44(10):1079-87. doi: 10.1073/pnas.44.10.1079.