Kamarul Baharin, Muhammad Khaizuran, and Wan Suhaimizan Wan Zaki. “Development of Forehead Electrooculogram (EOG) Measurement Device Using Plastic Optical Fibre”. Evolution in Electrical and Electronic Engineering, vol. 3, no. 2, Nov. 2022, pp. 941-8, https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/8890.