Syafiqri Alfarizki, and Gatot Yudoko. “IMPROVING SALES FORECAST ACCURACY USING LEAN SIX SIGMA: A CASE STUDY IN THE FMCG INDUSTRY”. Multidiciplinary Output Research For Actual and International Issue (MORFAI), vol. 6, no. 3, Feb. 2026, pp. 3270-89, https://radjapublika.com/index.php/MORFAI/article/view/5150.