Tantiphanwadi P, Siripanya A, Panyakunanont P, Thanachotanankul P, Wongpatiwate N, Phwngmalay S, Waiyanit S. Production Improvement Steps: Lean, Six Sigma and Lean Automation. NUEJ [internet]. 2020 Dec. 21 [cited 2026 Sep. 11];15(2):47-64. available from: https://ph01.tci-thaijo.org/index.php/nuej/article/view/240607