SEN, A. K.; SANCHIS, E. J. Education Quality Improvement in the Management Institute through Six Sigma Approach. SFIMAR Research Review, [S. l.], v. 7, n. 2, p. 40–54, 2012. Disponível em: https://sfimar.srels.org/index.php/srr/article/view/109180. Acesso em: 28 jan. 2026.