Raden Duta Ikrar Abadi, E. Yulianto, T. Triwiyanto, S. Kumar Gupta, and V. Abdullayev, “Measurement of Vital Signs Respiratory Rate Based on Non Contact Techniques Using Thermal Camera & Web Camera with Facial Recognition”, j.electron.electromedical.eng.med.inform, vol. 4, no. 2, pp. 70-76, Apr. 2022.