Promphiphak P, Chidchob P, Khamsuwan S. Effect of Mixing on Biogas Production Rate in a Two-Stage Digester. JEIT [internet]. 2026 Apr. 28 [cited 2026 Oct. 7];4(2):1-11. available from: https://ph03.tci-thaijo.org/index.php/JEIT/article/view/4357