Mubarok, Alvian Alvin, Heri Susanto, and Handani Maheresmi. “The Role of Lean Operations on Company Performance Mediated by Six Sigma at the Yogyakarta Regional Public Service Agency (BLUD)”. RSF Conference Series: Business, Management and Social Sciences 5, no. 2 (October 14, 2025): 472–481. Accessed October 21, 2025. https://proceeding.researchsynergypress.com/index.php/rsfconferenceseries1/article/view/1048.