STOPENOVÁ, A. Space imagination as a precondition for geometry learning. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 3, p. 253–257, 2003. Disponível em: https://studmath.uken.krakow.pl/article/view/13497. Acesso em: 30 oct. 2026.