MOSZNER, Z. On stability of some functional equations and topology of their target spaces. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 11, p. 69–94, 2012. Disponível em: https://studmath.uken.krakow.pl/article/view/13211. Acesso em: 30 oct. 2026.