1. C. Suwit, The study of the improvement of waste-water quality for the gas stations in Thailand, Sanitary Engineering Department, Mahidol University, Bangkok, August 1997.
2. A fundamental study of the ultrafiltration of oil/water emulsion;Lipp;J. Membr. Sci.,1987
3. Concentration polarization, membrane fouling and cleaning in ultrafiltration of soluble oil;Lee;J. Membr. Sci.,1984
4. Concentration polarization with membrane ultrafiltration;Porter;J. Ind. Eng. Chem. Prod.,1972
5. P. Weber, W. Ruppricht, R. Knauf, Spiral wound modules used in the separation of oil/water emulsions, Aachener Membrane Kolloquqium, CELGARD GmbH, Germany, October 1997.