Ivan Blecic Arnaldo Cecchini Giuseppe A. Trunfio Towards a Cooperative Visual Authoring Environment for Storytelling. 299-306 2008 CDVE http://dx.doi.org/10.1007/978-3-540-88011-0_44 conf/cdve/2008 db/conf/cdve/cdve2008.html#BlecicCT08