Simplified Hotel System by Linking Matrices and e-Abacus Diagram. Journal of Education and Science, [S. l.], v. 35, n. 2, p. 83–88, 2026. DOI: 10.33899/jes.v35i2.53598. Disponível em: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/53598. Acesso em: 23 jun. 2026.