MARTYNYUK, A. The conditions of Hyers—Ulam—Rassias-stability of a set of equations . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 8, p. 11–16, 2024. DOI: 10.15407/dopovidi2017.08.011. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/7688. Acesso em: 1 oct. 2024.