A. Groß, B. Baumann, J. Bross, and C. Meinel. SIGUCCS '09: Proceedings of the ACM SIGUCCS fall conference on User services conference, page 79--84. New York, NY, USA, ACM, (2009)
K. Wolf, S. Linckels, and C. Meinel. SIGUCCS '07: Proceedings of the 35th annual ACM SIGUCCS conference on User services, page 366--371. New York, NY, USA, ACM, (2007)