@article{thetwoechelonroutingproblemwithtruck,
  title = {The two-echelon routing problem with truck and drones},
  author = {Minh Hoàng Hà and Lam Vu and Duy Manh Vu},
  year = {2020},
  eprint = {2004.02275},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2004.02275v1},
}