Meeting R of. 18th International Conference on Functional Equations and Inequalities, Będlewo, Poland, July 9-15, 2019. Ann. Univ. Paedagog. Crac. Stud. Math. [Internet]. 2019 Nov. 21 [cited 2024 May 7];18:167-92. Available from: https://studmath.uken.krakow.pl/article/view/7952