GUNČAGA, J. Regulated functions and integrability. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 8, p. 43–56, 2009. Disponível em: https://studmath.uken.krakow.pl/article/view/13258. Acesso em: 30 oct. 2026.