Żyjewski, K. (2011) “Nonlocal Robin problem in a plane domain with a boundary corner point”, Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, 10, pp. 5–34. Available at: https://studmath.uken.krakow.pl/article/view/13216 (Accessed: 11 November 2026).