MAJUMDAR, S.; DEY, K. K.; HOSSAIN, M. A. 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: 17 jul. 2024.