JAŚKIEWICZ, W.; JAŚKIEWICZ-BAUMAN, A. About practical exercises taken from real life. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 3, p. 87–93, 2003. Disponível em: https://studmath.uken.krakow.pl/article/view/13472. Acesso em: 30 oct. 2026.