ASSANOVA, A. T. To the theory of nonlocal problems with integral conditions for systems of equations of hyperbolic type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 10, p. 1313–1323, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1637. Acesso em: 5 dec. 2025.