[1]
“Existence of Viscosity Solutions of Second Order Fully Nonlinear Elliptic Equations”, J. Part. Diff. Eq., vol. 4, no. 1, pp. 21–32, Apr. 1991, Accessed: Dec. 05, 2025. [Online]. Available: https://global-sci.com/index.php/jpde/article/view/3670