ROŻEK, B. Perception of rectangular and skew structures in a row-column arrangement of figures. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 3, p. 215–221, 2003. Disponível em: https://studmath.uken.krakow.pl/article/view/13491. Acesso em: 30 oct. 2026.