IVASYSHEN, S. D.; KONDUR, O. S. On the analyticity of solutions of $\overrightarrow{2b}$-parabolic systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 2, p. 160–167, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3444. Acesso em: 6 dec. 2025.