LUTFIAH, Lutfiah; SUDIRMAN, Sudirman; WAHYUNINGRUM, Endang; CANTILLO-RUDAS, Benilda María. Cognitive barriers and Universal Design for Learning support in understanding number concepts in students with intellectual disabilities. Polyhedron International Journal in Mathematics Education, [S. l.], v. 4, n. 2, p. 165–192, 2026. DOI: 10.59965/pijme.v4i2.319. Disponível em: https://nakiscience.com/index.php/pijme/article/view/319. Acesso em: 17 oct. 2026.