@article{karoonsoontawong2020multi,
  title={Multi-trip time-dependent vehicle routing problem with soft time windows and overtime constraints},
  author={Karoonsoontawong, Ampol and Punyim, Puntipa and Nueangnitnaraporn, Wanvara and Ratanavaraha, Vatanavongs},
  journal={Networks and Spatial Economics},
  volume={20},
  pages={549--598},
  year={2020},
  publisher={Springer US}
}

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