ŚLOSARSKI, M. Metrizable space of multivalued maps. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 20, p. 77–93, 2021. Disponível em: https://studmath.uken.krakow.pl/article/view/8523. Acesso em: 16 oct. 2024.