TEAM, S. Hyers-Ulam Stability of Linear Differential Equations y′′ = λ2y: Yongjin Li. Thai Journal of Mathematics, [S. l.], v. 8, n. 2, p. 215–219, 2010. Disponível em: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/193. Acesso em: 7 may. 2024.