1. Environmental problems — a transnational solution supporting co-operation of all relevant social forces;Burgard,1997
2. SIRIUS — Saarbrücken Information Retrieval and Interchange Utility Set;Denzer,1995
3. Requirements of meta information models for the environmental domain;Denzer;J. Comput. Information,1996
4. Metadaten für die Integration von Datenbeständen;Denzer,1996
5. Integration in environmental information systems;Denzer,1993