WIŚNIEWSKI, D. Boundary value problems for a second-order elliptic equation in unbounded domains. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 9, p. 87–122, 2010. Disponível em: https://studmath.uken.krakow.pl/article/view/13249. Acesso em: 31 oct. 2026.