@article{stacherl2023gravity,
  title={Gravity models for potential spatial healthcare access measurement: a systematic methodological review},
  author={Stacherl, Barbara and Sauzet, Odile},
  journal={International Journal of Health Geographics},
  volume={22},
  number={1},
  pages={1--19},
  year={2023},
  publisher={Springer}
}

@misc{portland_gravity,
  title={Gravity and Spatial Interaction Models},
  author={Haynes, Kingsley E. and Fotheringham, A. Stewart},
  howpublished={\url{https://web.pdx.edu/~stipakb/download/PA557/ReadingsPA557sec1-2.pdf}},
  note={Accessed: 2025-06-23}
}

@article{toth2015accessibility,
  title={Accessibility Models Based On the Gravity Analogy: In Theory and Practice},
  author={T{\'o}th, G{\'e}za and Kincses, {\'A}ron},
  journal={Munich Personal RePEc Archive},
  number={73952},
  year={2015},
  publisher={Hungarian Central Statistical Office},
  url={https://mpra.ub.uni-muenchen.de/73952/1/MPRA_paper_73952.pdf}
}

@book{haynes1984gravity,
  title={Gravity and Spatial Interaction Models},
  author={Haynes, Kingsley E. and Fotheringham, A. Stewart},
  year={1984},
  publisher={Sage Publications}
}