MITROPOLSKIY, Yu. A.; KHOMA, G. P.; TSYNALKO, P. V. A periodic problem for the inhomogeneous equation of string oscillations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 4, p. 558–565, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5031. Acesso em: 14 apr. 2025.