F. Abel, J. Coi, N. Henze, A. Koesling, D. Krause, and D. Olmedilla. WEBIST 2009 - Proceedings of the Fifth International Conference
on Web Information Systems and Technologies, Lisbon, Portugal,
March 23-26, 2009, page 184-191. INSTICC Press, (2009)
R. Aler, D. Borrajo, and P. Isasi. Proceedings of the 2001 Congress on Evolutionary
Computation CEC2001, page 1220--1227. COEX, World Trade Center, 159 Samseong-dong,
Gangnam-gu, Seoul, Korea, IEEE Press, (27-30 May 2001)