HUFFMAN, D. Increasing Data Density with Multivariate Symbols. Cartographic Perspectives, [S. l.], n. 64, p. 64–65, 2009. DOI: 10.14714/CP64.152. Disponível em: https://cartographicperspectives.org/index.php/journal/article/view/cp64-huffman. Acesso em: 2 may. 2024.