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Dotsynsky, I.A., Gramatikov, B.I. & Daskalov, I.K. A digital heart-ratemeter using an e.p.r.o.m. converter. Med. Biol. Eng. Comput. 18, 481–482 (1980). https://doi.org/10.1007/BF02443322
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DOI: https://doi.org/10.1007/BF02443322