LOU, Zhenluo. EXISTENCE OF MANY NON-RADIAL SOLUTIONS OF AN ELLIPTIC SYSTEM. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 40, p. 172–179, 2018. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7040. Acesso em: 17 oct. 2026.