KHADEMLOO, Somayeh; HEIDARKHANI, Shapur. Existence of non-negative solutions for semilinear elliptic systems via variational methods. Nonlinear Analysis: Modelling and Control, [S. l.], v. 17, n. 2, p. 194–209, 2012. DOI: 10.15388/NA.17.2.14068. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/14068. Acesso em: 11 apr. 2025.