ALI MAHMOOD HASEN; SURA NAUFEL BAHJAT; BAN MAJID SADEQ. STUDYING THE POSSIBILITY OF APPLYING SIX SIGMA STRATEGY TO INCREASE PERFORMANCE EFFICIENCY AND QUALITY OF HEALTH SECTOR SERVICES. World Economics and Finance Bulletin, [S. l.], v. 9, p. 25-39, 2022. Disponível em: https://scholarexpress.net/index.php/wefb/article/view/775. Acesso em: 19 apr. 2025.