P. Bitzer, F. Weiß, und J. Leimeister. Eighth International Conference on Design Science Research in Information Systems and Technology (DESRIST), Helsinki, Finland (accepted for publication), (2013)
J. Tang, H. fung Leung, Q. Luo, D. Chen, und J. Gong. IJCAI'09: Proceedings of the 21st international jont conference on Artifical intelligence, Seite 2089--2094. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2009)