ŻYJEWSKI, K. Nonlocal Robin problem in a plane domain with a boundary corner point. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 10, p. 5–34, 2011. Disponível em: https://studmath.uken.krakow.pl/article/view/13216. Acesso em: 11 nov. 2026.