Dahl, C. F.; Ewy, G. A.; Warner, E. D.; Thomas, E. D. (1974). „Myocardial necrosis from direct current countershock: effect of paddle electrode size and time interval between discharges”. Circulation. 50 (5): 956—61. PMID4430099. doi:10.1161/01.CIR.50.5.956.
Dahl, C. F.; Ewy, G. A.; Warner, E. D.; Thomas, E. D. (1974). „Myocardial necrosis from direct current countershock: effect of paddle electrode size and time interval between discharges”. Circulation. 50 (5): 956—61. PMID4430099. doi:10.1161/01.CIR.50.5.956.