Shofiyah, S., I. D. G. Hari Wisana, T. Triwiyanto, and S. Luthfiyah. “Measuring Respiration Rate Via Android”. Indonesian Journal of Electronics, Electromedical Engineering, and Medical Informatics, Vol. 1, no. 1, Aug. 2019, pp. 20-26, doi:10.35882/ijeeemi.v1i1.4.