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2. L. V. Chireikin, D. Ya. Shurygin, and V. K. Latutin, Computerized ECG Analysis [in Russian], Leningrad (1977).
3. A. A. Kharkevich, Spectra and Analysis, 3rd Edition [in Russian], Moscow (1957).
4. A. Kh. Kuliev, Electrocardiography in Clinical Cardiac Pathology [in Russian], Baku (1969).
5. B. Gold and C. M. Rader, Digital Processing of Signals [Russian translation], Moscow (1973).