MITYUSHEV, V. Boundary value problem and functional equations for overlapping disks. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 6, p. 131–136, 2007. Disponível em: https://studmath.uken.krakow.pl/article/view/13286. Acesso em: 31 oct. 2026.