K.C. Huong, Audrey, P E. Ong, V H. Tsen, and Xavier T. I. Ngu. 2018. “A Handheld Technology for Optical Monitoring of Transcutaneous Blood Oxygen Saturation”. International Journal of Engineering & Technology 7 (3.20): 122-26. https://doi.org/10.14419/ijet.v7i3.20.18994.