Receiving Recommendations and Providing Feedback: The User-Experience of a Recommender System. - Bart P. Knijnenburg; Martijn C. Willemsen; Stefan Hirtbach (EC-Web, 2010)

Software in the City: Visual Guidance Through Large Scale Software Projects. - Marc Schreiber; Stefan Hirtbach; Bodo Kraft; Andreas Steinmetzler (Software Engineering, 2013)