MEETING, R. of . 18th International Conference on Functional Equations and Inequalities, Będlewo, Poland, July 9-15, 2019. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 18, p. 167–192, 2019. Disponível em: https://studmath.uken.krakow.pl/article/view/7952. Acesso em: 7 may. 2024.