N. Vinh, J. Epps, and J. Bailey. ICML '09: Proceedings of the 26th Annual International Conference on Machine Learning, page 1073--1080. New York, NY, USA, ACM, (2009)
A. Weingessel, E. Dimitriadou, and S. Dolnicar. Working Paper 29. SFB ``Adaptive Information Systems and Modeling in Economics and Management Science'', (1999)