Lily D. Li Xiaodong Li Xinghuo Yu A multi-objective constraint-handling method with PSO algorithm for constrained engineering optimization problems. 1528-1535 2008 IEEE Congress on Evolutionary Computation http://dx.doi.org/10.1109/CEC.2008.4630995 conf/cec/2008 db/conf/cec/cec2008.html#LiLY08