Sheth, R., N. C. Chauhan, M. M. Goyani, and K. A. Mehta. “PCA Based Handwritten Character Recognition System Using Support Vector Machine & Neural Network”. Applied Science and Engineering Progress, vol. 4, no. 4, Sept. 2013, pp. 69-75, https://ph02.tci-thaijo.org/index.php/ijast/article/view/67355.