LAU, Anthony To-Ming; YAO, Liangjin. Amenability and Hahn-Banach extension property for set-valued mappings. Topological Methods in Nonlinear Analysis, [S. l.], v. 53, n. 2, p. 547–573, 2019. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2019.011. Acesso em: 8 jul. 2025.