SophieServer: The Future of Reading. - Robert Hirschfeld; Michael Haupt; Michael Rüger; Patrick Brünn; Ronny Esterluß; Norman Holz; Kerstin Knebel; Robert Timm (C5, 2008)

Sophie. - Norman Holz; Robert Hirschfeld; Jens Lincke; Michael Haupt; Michael Rüger (C5, 2009)

Strategies for visualising 3D points-of-interest on mobile devices. - Matthias Trapp 001; Lars Schneider; Christine Lehmann; Norman Holz; Jürgen Döllner (J. Locat. Based Serv., 2011)