@article{theoxycontinreformulationrevisitednew,
  title = {The OxyContin Reformulation Revisited: New Evidence From Improved Definitions of Markets and Substitutes},
  author = {Shiyu Zhang and Daniel Guth},
  year = {2021},
  eprint = {2101.01128},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2101.01128v2},
}