Liu, Liang, Ling Zhang, Xiangguang Dai, and Yuming Feng. 2018. “NAGSC: NESTEROV’S ACCELERATED GRADIENT METHODS FOR SPARSE CODING: Sparse Coding”. Italian Journal of Pure and Applied Mathematics 40 (July):724-35. https://journals.uniurb.it/index.php/ijpam/article/view/6966.