LAJKÓ, K. Generalized Hosszú functional equations. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 1, p. 59–68, 2001. Disponível em: https://studmath.uken.krakow.pl/article/view/13517. Acesso em: 30 oct. 2026.