Huong, Audrey, and Xavier Ngu. “Empirical Analysis Based on Light Attenuation Gradient of Wavelength Pairs for the Prediction of Skin Oxygen Status”. International Journal of Integrated Engineering 9, no. 1 (March 13, 2017). Accessed July 23, 2024. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/1532.