S. N. S. Safi’e, N. Zainul Azlan, Z. Tasneem, O. E. M. Shweesh, and I. Suwarno, “Facial Expression Recognition using Stretchable Sensor and Multilayer Feedforward Backpropagation Neural Network”, Int. J. of Comput. Thinking. Data Sci., vol. 7, no. 1, pp. 44–57, Nov. 2025.