Jörn Möltgen Benno Schmidt Werner Kuhn Landscape Editing with Knowledge-Based Measure Deductions for Ecological Planning. 139-152 http://link.springer.de/link/service/series/0558/bibs/1737/17370139.htm 1999 conf/isd/1999 Integrated Spatial Databases db/conf/isd/isd1999.html#MoltgenSK99