1. Concepts for a Hydraulic Aquifer Clean-up beneath a Landfill Author International Association of Hydrogeologists. Congress (25th : 1994 : Adelaide, S. Aust.), Forkel, Christian, Eiken, Georg, Birkholzer, Jens, and Rouve, Gerhard Published 1994
2. Anthropogenic Effects on Shallow Groundwaters in the Munsterland Region, FRG Author International Association of Hydrogeologists. Congress (25th : 1994 : Adelaide, S. Aust.) and Loehnert, EP Published 1994