@inproceedings{Kukkonen04a,
   author = {Saku Kukkonen and Jouni Lampinen},
   title = {{An Extension of Generalized Differential Evolution for
   Multi-objective Optimization with Constraints}},
   booktitle = {Parallel Problem Solving from Nature - PPSN VIII},
   pages = {752--761},
   publisher = {Springer-Verlag. Lecture Notes in Computer Science Vol. 3242},
   month = {September},
   address = {Birmingham, UK},
   year = {2004}
}