SHAHOODH , Mohammed Khalid. BA-Semigroup. Tikrit Journal of Pure Science, [S. l.], v. 28, n. 3, p. 105–108, 2023. DOI: 10.25130/tjps.v28i3.1435. Disponível em: https://tjps.tu.edu.iq/index.php/tjps/article/view/1435. Acesso em: 21 may. 2024.