SZEMBERG, T.; SZPOND, J. Editorial. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 16, p. 5, 2017. Disponível em: https://studmath.uken.krakow.pl/article/view/13148. Acesso em: 29 oct. 2026.