Piyavadee Srivichai และ Sakesun Thongtip. (2021) Optimization of mixing speed and retention time affecting biogasproduction from starchy sediment using response surface methodology. <i>Songklanakarin Journal of Science and Technology (SJST)</i>, <i>43</i>(3), 767-773.Piyavadee Srivichai และ Sakesun Thongtip. "Optimization of mixing speed and retention time affecting biogasproduction from starchy sediment using response surface methodology". Songklanakarin Journal of Science and Technology (SJST) 43 (2021):767-773.Piyavadee Srivichai และ Sakesun Thongtip. Optimization of mixing speed and retention time affecting biogasproduction from starchy sediment using response surface methodology. Research and Development Office,Prince of Songkla University:ม.ป.ท. 2021.