KNOP, J.; WRÓBEL, M. Some properties of i-connected sets. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 6, p. 51–56, 2007. Disponível em: https://studmath.uken.krakow.pl/article/view/13279. Acesso em: 31 oct. 2026.