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2. E. I. Borisova and V. S. Rusinov, Fiziol. Zhur. SSSR 2, 216 (1949).
3. N. A. Kelareva, Fiziol. Zhur. SSSR 1, 74 (1959).
4. E. A. Kyandzhuntseva, in: Materials on Experimental and Clinical Electrocardiography [in Russian] (Moscow, 1953) p. 173.
5. G. F. Lang, Problems of Circulatory Pathology and of Clinical Aspects of Cardiovascular Diseases [in Russian] (Leningrad, 1936) chap. 1.