OF MEETING, R. 7th International Conference on Functional Equations and Inequalities, Złockie, September 12–18, 1999. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 1, p. 163–201, 2001. Disponível em: https://studmath.uken.krakow.pl/article/view/13527. Acesso em: 30 oct. 2026.