Barbosa, Ana, Isabel Vale, e Pedro Palhares. «Pattern tasks: Thinking processes used by 6th grade students». Revista Latinoamericana de Investigación en Matemática Educativa 15, no. 3 (novembro 7, 2011): 273–293. Acedido agosto 26, 2026. https://relime.org/index.php/relime/article/view/230.