Christian Biemann Karsten Böhm Gerhard Heyer Ronny Melz SemanticTalk: Software for Visualizing Brainstorming Sessions and Thematic Concept Trails on Document Collections. 534-536 http://dx.doi.org/10.1007/b100704 2004 conf/pkdd/2004 PKDD db/conf/pkdd/pkdd2004.html#BiemannBHM04