Goel, Divya, Vicenţiu D. Rădulescu, and Konijeti Sreenadh. “Variational Framework and Lewy-Stampacchia Type Estimates for Nonlocal Operators on Heisenberg Group”. Annales Fennici Mathematici 47, no. 2 (April 27, 2022): 707–721. Accessed May 26, 2022. https://afm.journal.fi/article/view/116794.