M. Böhringer, P. Gluchowski, C. Kurze, and C. Schieder. Proceedings of the 31st International Conference on Information Technology Interfaces (ITI), Cavtat/Dubrovnik, Croatia, June 22-25, 2009, page in press. (2009)
E. Mao, A. Salam, and K. Soliman. Communications of the Association for Information Systems, (2003)Available at: http: / / aisel. aisnet. org / cais / vol 11 / iss 1 / 16.