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2. I. P. Pavlov, Centripetal Nerves of the Heart, In Russian. St. Petersburg, 1883.
3. A. M. Sigal, Heart Rhythms and their Disturbances, In Russian. Odessa, 1935.
4. L. Ya. Siterman, Disturbances of Heart Rhythm, In Russian. Minsk, 1935.
5. A. D. Speransky, Elements for the Construction of a Theory of Medicine, In Russian. VIEM Press, 1937.