BARANNYK, A. F.; YURYK, I. I. A new method for the construction of solutions of nonlinear wave equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 5, p. 583–593, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4646. Acesso em: 6 dec. 2025.