1. Alberts E.E., Spomer R.G., 1985. Nitrate movement in deep loess soils. ASAE Paper no. 85–2030. American Society of Agricultural Engineers, St. Joseph, MI
2. Ackermann W.C., 1981. Water Resources Policy, Class, Notes. University of Illinois at Urbana-Champaign, IL
3. Ambrose R.B., Wool T.A., Connolly J.P. and Schanz R.W., 1988. WASP4, a hydrodynamic and water quality modelModel theory, user’s manual, and programmer’s guide, Report, No. EPA/600/3-87-039. U.S. Environmental Protection Agency, Athens, GA
4. Archives D’Architecture Moderne, 1997. Brussels and the Senne, Brussels, Belgium
5. Armstrong C.L., Mitchell J.K. and Walker P.N., 1980. Soil loss estimation-Research in Africa—A review, in Assessment of Erosion, De Boodt M. and Gabriels D. (eds.), John Wiley and Sons, New York, 285–294