@article{Liu:20173c,
  author = "Liu, Tianshi  and  QIN, Shuanshuan  and  Zhang, Liumei",
  title = "{Improved Ant Colony Optimization in Express Distribution Routing}",
  doi = "10.22323/1.299.0012",
  journal = "PoS",
  year = 2017,
  volume = "CENet2017",
  pages = "012"
}