Evolution of a participatory GIS. - Angi Voß; Ivan Denisovich; Peter Gatalsky; Kiriakos Gavouchidis; Andreas Klotz; Stefanie Roeder; Hans Voß (Comput. Environ. Urban Syst., 2004)

Software Support for Annotation of Visualized Data Using Hand-Drawn Marks. - Ivan Denisovich (IV, 2005)