MAJUMDAR, Subrata; DEY, Kalyan Kumar; HOSSAIN, Mohd Altab. Direct product and wreath product of transformation semigroups. GANIT: Journal of Bangladesh Mathematical Society, [S. l.], v. 31, p. 1–7, 2012. DOI: 10.3329/ganit.v31i0.10303. Disponível em: https://banglajol.info/index.php/GANIT/article/view/10303. Acesso em: 8 jan. 2025.