1. Harken DE, Soroff HS, Birtwell WC. Assisted circulation: counterpulsation and coronary artery disease. Surg Annu. 1972;4:165–89.
2. Clauss RH, Birtwell WC, Albertal G, et al. Assisted circulation. I. The arterial counterpulsator. J Thorac Cardiovasc Surg. 1961;41:447–58.
3. Nachlas MM, Siedband MP. The influence of diastolic augmentation on infarct size following coronary artery ligation. J Thorac Cardiovasc Surg. 1967;53(5):698–706.
4. Soroff HS, Ruiz U, Birtwell WC, Many M, Giron F, Deterling Jr RA. Assisted circulation by external pressure variation. Isr J Med Sci. 1969;5(4):506–14.
5. Jacobey JA, Taylor WJ, Smith GT, Gorlin R, Harken DE. A new therapeutic approach to acute coronary occlusion. II. Opening dormant coronary collateral channels by counterpulsation. Am J Cardiol. 1963;11:218–27.