“Facial Expression Based Face Recognition Using Machine Learning with SVM Kernel: HMM and FDA”, Int. J. Emerg. Trends Sci. Technol., vol. 2, no. 03, Mar. 2015, Accessed: Sep. 28, 2026. [Online]. Available: http://igmpublication.com/ijetst.in/index.php/ijetst/article/view/525