KHAIRI KHALIL, J.; جوان; MAHMOOD, A.; عمار. On Left Slides (Upper or Lower) in e-Abacus Diagram. Journal of Education and Science (JES), [S. l.], v. 32, n. 1, p. 38–46, 2023. DOI: 10.33899/edusj.2023.136997.1295. Disponível em: https://rjps.uomosul.edu.iq/index.php/edusj/article/view/18436. Acesso em: 4 aug. 2025.