Marcus, Moshe, and Laurent Véron. “Boundary Trace of Positive Solutions of Nonlinear Elliptic Inequalities”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 3, no. 3 (December 14, 2009): 481-533. Accessed May 26, 2025. http://20.103.181.36/index.php/annaliscienze/article/view/46.