1. Allen RG (2001) REF-ET: reference evapotranspiration calculation software for FAO and ASCE standardized equations. Version 2. The University of Idaho
2. Allison GB, Gee GW, Tyler SW (1994) Vadose-zone techniques for estimating groundwater recharge in arid and semiarid regions. Soil Sci Soc Am J 58:6–14
3. Allman MA, Delaney MD, Smith DW (1998) A field study of seasonal ground movement in expansive soils. In: Proceedings of the second international conference on unsaturated soils UNSAT’98, Beijing, pp 309–314
4. Alonso E, Gens A, Lloret A, Delahaye C (1995) Effect of rain infiltration on the stability of slopes. In: Proceedings of the first international conference on unsaturated soils UNSAT’95, vol. 1. Paris, pp 241–256
5. Anderson JE (1997) Soil-plant cover systems for final closure of solid waste landfills in arid regions. Landfill capping in the semi-arid west: problems. Perspectives and Solutions, Idaho Falls, pp 27–38