Melіkіdze T. V. On application of the averaging method to the solution of one non-linear integro-differential equation with small parameter of hyperbolic type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 2, p. 257–261, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8511. Acesso em: 6 dec. 2025.