1. Fremdenverkehr im Burgenland 1970–1979;Amt der Burgenländischen Landesregierung,1980
2. Ecological simulation for aquatic environments;Chen,1975
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4. Environmental Modeling under Uncertainty: Monte Carlo Simulation;Fedra,1982
5. A modular interactive decision support system: a casestudy of eutrophication and regional development;Fedra,1983