@Inproceedings{haller2009rfdkmt, address = "Graz", author = "Heiko Haller and Andreas Abecker", booktitle = "Proceedings of IKNOW2009, 9th International Conference on Knowledge Management and Knowledge Technologies", editor = "Klaus Tochtermann", month = "September", publisher = "KnowCenter", title = "Requirements for Diagrammatic Knowledge Mapping Techniques", year = "2009", }