Bedjo Utomo, S. Syaifudin, E. Dian Setioningsih, T. Hamzah, and P. Parameswaran, “Oximeter and BPM on Smartwatch Device Using Mit-App Android with Abnormality Alarm ”, j.electron.electromedical.eng.med.inform, vol. 3, no. 2, pp. 85-92, Jul. 2021.