@article{Coello98a,
   author = {Carlos A. {Coello Coello} and Alan D. Christiansen},
   journal = {Civil Engineering Systems},
   key = {Coello \& Christiansen, 1998a},
   title = {Two {N}ew {G}{A}-based methods for multiobjective optimization},
   volume = {15},
   number = {3},
   pages = {207--243},
   year = {1998}
}