@ARTICLE{Gong2013rankiMDDE,
  title = {Engineering optimization by means of an improved constrained differential evolution},
  author = {Wenyin Gong and Zhihua Cai and Dingwen Liang},
  journal = {Computer Methods in Applied Mechanics and Engineering},
  year = {2013},
  note = {In press},
  pages = {1 - 23},
  publisher = {Elsevier},
}