U. Riss, и O. Grebner. Proceedings of I-KNOW '06, 6th International Conference on Knowledge Management, Graz, Austria, September 6 - 8, 2006, (сентября 2006)
H. Witschel, T. Nguyen, и K. Hinkelmann. BUSTECH 2012 (Second International Conference on Business Intelligence and Technology, July 22-27, 2012, Nice, France), (2012)