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Duffin, E.G., Briller, S.A., Trost, R.F. et al. A 24-channel electrocardiographic preamplifier. Med. & biol. Engng. 9, 389–391 (1971). https://doi.org/10.1007/BF02474094
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DOI: https://doi.org/10.1007/BF02474094