Beltrain, J.M  . 1999.  Irrigation with saline water: benefits and environmental impact. Agricultural Water  Management. 40:183-194.

Bjorssen, P. and G. Berndes. 2006. The prospects for willow plantations for wastewater treatment in  Sweden. Biomass and Bionenergy. 30:428-438.

Caballero, R., A. Bustos, and R. Roman. 2001.  Soil Salinity under Traditional and Improved Irrigation Schedules in Central Spain. Soil Sci. Soc. Am. J. 65:1210-1218.

Dickman, D. 2004.  Silviculture and biology of short-rotation woody crops in temperate regions: Then and now . Biomass and Bioenergy. 30: 696-705.

Domitrou, I. and P. Aronsson. 2004. Nitrogen leaching from short-   rotation willow coppice after intensiceirrigation with wastewater. Biomass and Bionenery. 26. 433-441.

Domitrou, I. and P. Aronsson. 2005. Willows for energy and phytoremediation in Sweden. Unasylva. 56:221.

Hamman, A. 2009. REN R 480 Course Notes. University of Alberta, Renewable Resources Department. Edmonton, Alberta.

Wikipedia. 2009. Kolmogrov-Smirnov test. http://en.wikipedia.org/wiki/Kolmogorov_Smirnov_test. Accessed November 13, 2009.