1. Wills, J.( 2000). Muddied waters, environmental effects of drilling waste discharges. Available at: http://www.offshore‐environment.com/producedwaters.html (accessed November 2006).
2. The Ruckelshaus Institute of Environment and Natural Resources. ( 2005). Water production for coalbed methane development in Wyoming: A summary of quantity, quality and management options, prepared for The Office of the Governor, State of Wyoming. Available at: http://www.uwyo.edu/enr/ienr/CBMWaterFinalReportDec2005.pdf (accessed November 2006).
3. Viability of nanofiltration and ultra‐low pressure reverse osmosis membranes for multi‐beneficial use of methane produced water;Xu;Separation and Purification Technology,2006
4. Hayes, T., &Arthur, D.( 2004). Overview of emerging treatment technologies. In Proceedings of the 11th Annual International Petroleum Environmental Conference, Albuquerque, NM, October 12–15.