NELSON, E. S. Using Selective Attention Theory to Design Bivariate Point Symbols. Cartographic Perspectives, [S. l.], n. 32, p. 6–28, 1999. DOI: 10.14714/CP32.625. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp32-nelson. Acesso em: 29 apr. 2024.