KUZ, A. M.; PTASHNIK, B. I. A problem with integral conditions with respect to time for Garding hyperbolic equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 2, p. 252–265, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2416. Acesso em: 5 dec. 2025.