Li, Y., L. Kong, F. Shang, Y. Liu, H. Liu, and Z. Lin. “Learned Extragradient ISTA With Interpretable Residual Structures for Sparse Coding”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 10, May 2021, pp. 8501-9, doi:10.1609/aaai.v35i10.17032.