Firmansyah, M. Ardi, et al. “Pengenalan Angka Tulisan Tangan Menggunakan Diagonal Feature Extraction Dan Artificial Neural Network Multilayer Perceptron”. Indonesian Journal on Computing (Indo-JC), vol. 3, no. 1, May 2018, pp. 65-74, doi:10.21108/INDOJC.2018.3.1.214.