KALITA, E. A. Solvability of nonlinear elliptic systems with measure. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 7, p. 925–939, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5265. Acesso em: 5 dec. 2025.