1. Andersson, J. and Knis, P. Multi objective optimization of mixed variable design problems. First International Conference on Evolutionary Multi-Criterion Optimization. Zurich, Switzerland.
2. Multi-objective Genetic Algorithms: Problem Difficulties and Construction of Test Problems
3. Deb, K., Agrawal, S., Pratap, A. and Meyarivan, T. A fast elitist non-dominated sotting genetic algorithm for multi-objective optimization: NSGA-II. Parallel Problem Solving from Nature VI Conference.