@article{Demir14,
  author = {Emrah Demir and Tolga Bektas and Gilbert Laporte},
  title = {{The bi-objective Pollution-Routing Problem}},
  journal = {European Journal of Operational Research},
  volume = {232},
  number = {3},
  pages = {464--478},
  month = {February 1},
  year = {2014}
}