JAGODA, E. On children’s understanding of area. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 3, p. 77–86, 2003. Disponível em: https://studmath.uken.krakow.pl/article/view/13471. Acesso em: 30 oct. 2026.