POKORA, P.; SKRZYŃSKI, M. Rank function equations. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 11, p. 101–110, 2012. Disponível em: https://studmath.uken.krakow.pl/article/view/13213. Acesso em: 31 oct. 2026.