A survey of half-groups. Albayan Scientific Journal , [S. l.], n. 11, p. 203–200, 2023. DOI: 10.37375/bsj.vi11.2254. Disponível em: https://elc2.su.edu.ly/index.php/bayan/article/view/2254. Acesso em: 8 dec. 2025.