WEI, Yawei; ZHOU, Xiaodong. The kernel space of linear operator for a class of Grushin equation. Topological Methods in Nonlinear Analysis, [S. l.], p. 1–25, 2025. DOI: 10.12775/TMNA.2025.017. Disponível em: https://apcz.umk.pl/TMNA/article/view/67381. Acesso em: 14 dec. 2025.