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2. Automatic monitoring of Cardiac arrhythmias;Bryden,1976
3. Digital analysis of the electrocardiogram, the blood pressure and the electro-encephalogram;Cox,1972
4. Low power electrocardiographic data acquisition module for microprocessor systems;Fastik;Medical and Biological Engineering and Computing,1980
5. A QRS-preprocessor based on digital differentiation;Holsinger;IEEE Transactions in Biomedical Engineering,1971