Painmanakul, P. , Kongkangwarn, K. , Chawaloesphonsiya, N.. "Treatment of Oily Wastewater by Fibrous Coalescer Process: Stage Coalescer and Model Prediction". World Academy of Science, Engineering and Technology, Open Science Index 34, International Journal of Environmental and Ecological Engineering (2009), 3(10), 320 - 325.