AKHMETOV , M. U.; PERESTYUK, N. A. Integral sets of quasilinear pulse systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 1, p. 5–11, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2314. Acesso em: 6 dec. 2025.