On The Stability Problem of Quadratic Functional Equations in 2-Banach Spaces. JOURNAL OF ADVANCES IN PHYSICS, [S. l.], v. 13, n. 8, p. 5054–5061, 2017. DOI: 10.24297/jap.v13i8.6307. Disponível em: https://rajpub.com/index.php/jap/article/view/6307. Acesso em: 15 jun. 2026.