1. T. Thorsen, Fundamental Studies of Membrane Filtration of Coloured Surface Water, Ph.D. thesis, NTNU, Trondheim, 1999.
2. T. Thorsen, T. Krogh, E. Bergan, Removal of Humic Substances with Membranes: System, Use and Experiences, AWWA Proceedings, 1993 Membrane Technology Conference, Baltimore, 1993.
3. M.L. Arora, B.M. Michalczyl, Pilot scale evaluation of ultrafiltration to remove humic substances from groundwater, 1986 Ann. Conf. Proc. AWWA.
4. Removal of dissolved organic matter by nanofiltration;Amy;J. Environ. Eng.,1990
5. J. Mallevialle, C. Anselme, O. Marsigny, Effects of humic substances on membrane processes, in: I.H. Suffet, P. MacCarty, (Eds.), Aquatic Humic Substances, American Chemical Society, Washington, 1989.