P. Kluegl, M. Atzmueller, and F. Puppe. Proceedings of the Biennial GSCL Conference 2009, 2nd UIMA@GSCL Workshop, page 233-240. Gunter Narr Verlag, (2009)
C. Wang, J. Han, Y. Jia, J. Tang, D. Zhang, Y. Yu, and J. Guo. Proceedings of the 16th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 203--212. New York, NY, USA, ACM, (2010)