ZINCHENKO, T. N.; MURACH, A. A. Douglis-Nirenberg elliptic systems in Hörmander spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 11, p. 1477–1476, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2674. Acesso em: 5 dec. 2025.