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[5] Allen, John. "Photoplethysmography and Its Application in Clinical Physiological Measurement," Physiological Measurement 28.3, 2007.

[6] M. Tavakoli, L. Turicchia and R. Sarpeshkar, "An Ultra-Low-Power Pulse Oximeter Implemented With an Energy-Efficient Transimpedance Amplifier," in IEEE Transactions on Biomedical Circuits and Systems, vol. 4, no. 1, pp. 27-38, Feb. 2010.