J. M. Delima, J. F. Pacyao, D. S. Zafra, and C. D. Dasargo, “Mobile Customers’ Charter with Mood Meter”, UMDRJ, vol. 8, no. 1, Dec. 2016, Accessed: Feb. 06, 2026. [Online]. Available: https://ieesjournals.com/index.php/umdrj/article/view/17