OLKUN, S. .; ALTUN, A. .; ŞAHIN, S. G. . Beyond Subitizing: Symbolic Manipulations of Numbers. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 10, n. 1, p. 93–103, 2015. Disponível em: http://ijlter.myres.net/index.php/ijlter/article/view/1133. Acesso em: 12 jan. 2026.