FOSGERAU, M. Selection from Upper Semi-Continuous Compact-Valued Mappings. MATHEMATICA SCANDINAVICA, [S. l.], v. 76, p. 247–256, 1995. DOI: 10.7146/math.scand.a-12540. Disponível em: https://www.mscand.dk/article/view/12540. Acesso em: 2 may. 2024.