Sitthiphat Eua-Apiwatch และ Siam Yimsiri. (2016) Investigation of average optical density and degree of liquids saturation in sand by image analysis method. <i>KKU Engineering Journal</i>, <i>43</i>(S1), 147-151.Sitthiphat Eua-Apiwatch และ Siam Yimsiri. "Investigation of average optical density and degree of liquids saturation in sand by image analysis method". KKU Engineering Journal 43 (2016):147-151.Sitthiphat Eua-Apiwatch และ Siam Yimsiri. Investigation of average optical density and degree of liquids saturation in sand by image analysis method. Faculty of Engineering, Khon Kaen University:ม.ป.ท. 2016.