of Meeting R. Conference on Ulam’s Type Stability Rytro, Poland, June 2-6, 2014. Ann. Univ. Paedagog. Crac. Stud. Math. [Internet]. 2014 Dec. 11 [cited 2026 Oct. 29];13:139-6. Available from: https://studmath.uken.krakow.pl/article/view/13191