SMAJDOR, A.; SMAJDOR, W. Local analytic solutions of a functional equation. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 4, p. 203–209, 2004. Disponível em: https://studmath.uken.krakow.pl/article/view/13319. Acesso em: 31 oct. 2026.