S. Ramli, R. Kamil, S. A. Ahmad, R. Mahmud, and N. Mohtarrudin, “Skin Blood Flow Response Signal Using Time and Frequency Domain Features for Pressure Ulcer Evaluation”, ijie, vol. 11, no. 3, Sep. 2019, Accessed: Jul. 23, 2024. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/4537