1. Agricultural Statistics (2001) Animal waste, Wyoming Agricultural Statistics Service, 2001 Wyoming Agricultural Statistics. www.wyomingbusiness.org/pdf/energy/biomass3.pdf
2. Andreadakis A, Gavalakis E, Kaliakatsos L, Noutsopoulos C, Tzimas A (2007) The Implementation of the water framework directive (WFD) at the River Basin of Anthemountas with emphasis on the pressures and impacts analysis. Desalination 210:1–15
3. Behrendt H, Dannowski R (eds) (2005) Nutrients and heavy metals in the Odra River System, emissions from point and diffuse sources, their loads, and scenario calculations on possible changes. Weißensee Verlag, Berlin, p 353
4. Bottcher D, Rhue D (2000) Fertilizer management—key to a sound water quality program, Circular 816, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, April 2000. http://edis.ifas.ufl.edu
5. Borah DK, Bera M (2003) Watershed-scale hydrologic and non-point source pollution models: review of mathematical bases. Trans American Soc Agric Biol Eng 46(6):1553–1566