@misc{zeng2018bounded,
  title={A Bounded Formulation for The School Bus Scheduling Problem},
  author={Liwei Zeng and Sunil Chopra and Karen Smilowitz},
  year={2018},
  eprint={1803.09040},
  archivePrefix={arXiv},
  primaryClass={math.OC},
  url={https://arxiv.org/abs/1803.09040}
}