Tengda Wei, Linshan Wang, Ping Lin, Jialing Chen, Yangfan Wang and Haiyong Zheng. (2017). Learning Non-Negativity Constrained Variation for Image Denoising and Deblurring. Numerical Mathematics: Theory, Methods and Applications. 10 (4). 852-871. doi:10.4208/nmtma.2017.m1653