OKAFOR, G. I.; AGBAEZE, E. K.; EKOJA, G. O.; OBAMEN, J. Effect of six sigma on performance of medium scale manufacturing firms in south-eastern Nigeria. International research journal of management, IT and social sciences, [S. l.], v. 5, n. 4, p. 26–45, 2018. DOI: 10.21744/irjmis.v5n4.253. Disponível em: https://sloap.org/journals/index.php/irjmis/article/view/253. Acesso em: 16 jul. 2024.