PT Unknown AU Külls, C TI Resolving patterns of groundwater flow by inverse hydrochemical modelling in a semiarid Kalahari BT Tracers and Modelling in Hydrogeology: TraM’2000: Proceedings of TraM’2000, the International Conference on Tracers and Modelling in Hydrogeology Held at Liège, Belgium, in May 2000 PY 2000 BP 447 IS 262 ER