C. Guevara Neri, O. O. Vergara Villegas, V. G. Cruz Sánchez, M. Nandayapa, and J. H. Sossa Azuela, “A Convolutional Neural Network for Handwritten Digit Recognition”, Int. Journal of COP and Infor., vol. 11, no. 1, pp. 97–105, Jan. 2020.