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A WIDE-RANGE LINEAR BEAT-BY-BEAT CARDIOTACHOMETER
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[2]
CZEKAJEWSKI J., 1965, MED ELECTRON BIOL ENG, V3, P57, DOI 10.1007/BF02474344
[3]
A TRANSISTOR INSTANTANEOUS FREQUENCY METER
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[5]
HEART RATE METER WITH DIGITAL TIMING AND LINEAR BEAT-TO-BEAT READOUT
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[6]
MACKAY RS, 1963, MED ELECTR BIOL ENG, V1, P109
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MANZOTTI M, 1956, ELECTRON ENG, V28, P446
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A HEART RATE METER FOR MEASUREMENT OF INSTANTANEOUS AND AVERAGE RATES
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[10]
MELVILLE AW, 1958, ELECTRON ENG, V30, P606