@article{chaiklin1991,
  title={Case Study Research: Design and Methods},
  author={Harris Chaiklin},
  year={1991},
  journal={The Journal of Nervous and Mental Disease},
  doi={10.1097/00005053-199102000-00025},
  url={https://doi.org/10.1097/00005053-199102000-00025}
}