1. Waller, A. D. (1887). A demonstration on man of electromotive changes accompanying the heart’s beat. Journal of Physiology, 8(5), 229–234.
2. Agarwala, R., Wang, P., Bishop, H. L., Dissanayak, A., & Calhoun, B. H. (2021). A 0.6V 785-nW multimodal sensor interface IC for ozone pollutant sensing and correlated cardiovascular disease monitoring. IEEE Journal of Solid-State Circuits, 36(4), 1058–1070.
3. Deepu, C. J., Xu, X. Y., Wong, D. L. T., Heng, C. H., & Lian, Y. (2018). A 2.3 $$\mu $$W ECG-on-chip for wireless wearable sensors. IEEE Transactions on Circuits and Systems-Part II: Express Briefs, 65(10), 1385–1389.
4. Zhang, X., Zhang, Z., Li, Y., Liu, C., Guo, Y. X., & Lian, Y. (2016). A 2.89 $$\mu $$W dry-electrode enabled clockless wireless ECG soc for wearable applications. IEEE Journal of Solid-State Circuits, 51(10), 2287–2297.
5. Bai, W., Zhu, Z., Li, Y., & Liu, L. (2018). A 64.8 $$\mu $$W $$>$$ 2.2 G$$\Omega $$ dc-ac configurable CMOS front-end IC for wearable ECG monitoring. IEEE Sensors Journal, 18(8), 3400–3409.