M. ARUNKUMAR; S. KARTHIKEYAN; S. HEMALATHA. Stability of 2-variable additive-quadratic-cubic-quartic functional equation using fixed point method. Malaya Journal of Matematik, India, v. 5, n. 02, p. 241–264, 2017. DOI: 10.26637/mjm502/004. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/591. Acesso em: 21 nov. 2024.