LI, Y. The Nirenberg problem in a domain with boundary. Topological Methods in Nonlinear Analysis, [S. l.], v. 6, n. 2, p. 309–329, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.048. Acesso em: 22 jul. 2024.