Marco Ragni Markus Knauff Deductive Spatial Reasoning: A Computational and a Cognitive Perspective. 13-17 2008 22 KI 1 http://www.kuenstliche-intelligenz.de/fileadmin/template/main/archiv/pdf/ki2008-01_page13-17_web_full.pdf db/journals/ki/ki22.html#RagniK08