J. Baumeister, T. Kleemann, and D. Seipel. FLAIRS'07: Proceedings of the 20th International Florida Artificial Intelligence Research Society Conference, page 524-529. AAAI Press, (2007)
J. Baumeister, M. Menge, and F. Puppe. FLAIRS'08: Proceedings of the 21th International Florida Artificial Intelligence Research Society Conference, page 329-334. AAAI Press, (2008)