1. Wu M, Zhang Z, Handwritten digit classification using the MNIST dataset (2010)
2. A. Dutta, Handwritten digit recognition using deep learning. Int. J. Adv. Res. Comput. Eng. & Technol. (IJARCET) 6(7) (2017)
3. N. Dalal, B. Triggs, Histograms of oriented gradients for human detection. Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR ’05), vol. 1 (San Diego, CA, USA, 20–26 June 2005) pp. 886–893
4. D.G. Lowe, Distinctive image features from scale-invariant keypoints. Int. J. Comput. Vis. 60, 2 (2004)
5. Y. LeCun et al., Backpropagation applied to handwritten zip code recognition. Neural Comput. 1(4), 541–551 (1989)