BORSUK, M. The transmission problem for elliptic second order equations in a conical domain. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 7, p. 61–89, 2008. Disponível em: https://studmath.uken.krakow.pl/article/view/13270. Acesso em: 31 oct. 2026.