OF MEETING, R. 15th International Conference on Functional Equations and Inequalities, Ustroń, May 19–25, 2013. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 12, p. 91–131, 2013. Disponível em: https://studmath.uken.krakow.pl/article/view/13187. Acesso em: 29 oct. 2026.