Image reconstruction for cone-beam computed tomography using total p-variation plus Kullback–Leibler data divergence
Cai Ai-Long, Li Lei, Wang Lin-Yuan, Yan Bin †, Zheng Zhi-Zhong, Zhang Han-Ming, Hu Guo-En
       

(color online) Examples of (a) p-shrinkage functions and (b) their induced penalty functions for some typical values of p.