Feller, M. N., Ya. I. Belopolskaya, and S. Albeverio. 2008. “Boundary Problems for Fully Nonlinear Parabolic Equations With Lévy Laplacian”. Methods of Functional Analysis and Topology 14 (1): 1-9. https://zen.imath.kiev.ua/index.php/mfat/article/view/365.