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3. An Investigation of the Relation of the Position of the Heart to the Electrocardiogram;Cohn;Heart,1921
4. The Distribution of the Potential Differences Produced by the Heart Beat Within the Body and at Its Surface;Wilson;Am. Heart J.,1930
5. Zeisler, E. B., and Katz, L. N.: Studies of the Properties of the Electrocardiogram. I. Invariants of the Electrocardiogram, (In press).