OF MEETING, R. 11th International Conference on Functional Equations and Inequalities, Będlewo, September 17–23, 2006. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 6, p. 137–179, 2007. Disponível em: https://studmath.uken.krakow.pl/article/view/13287. Acesso em: 29 oct. 2026.