@article{unknown1994a,
  title={A Classical Theory of the Informal Sector},
  author={Bill Gibson and Bruce Kelley},
  journal={The Mancehster School of Economic and Social Studies},
  volume={62},
  number={1},
  pages={81-96},
  journalpage={https://www.researchgate.net/publication/4776184_A_Classical_Theory_of_the_Informal_Sector},
  year={1994},
  citations={}
}