PRADHAN, Bibhuti B. Review Paper on Six-Sigma Technique. International Journal of Psychosocial Rehabilitation, [S. l.], v. 23, n. 6, p. 620–625, 2019. DOI: 10.61841/n90kbb66. Disponível em: https://psychosocial.com/index.php/ijpr/article/view/6440. Acesso em: 29 sep. 2025.