@article{misner1957,
  title={Classical physics as geometry},
  author={Charles W. Misner and John Wheeler},
  year={1957},
  journal={Annals of Physics},
  doi={10.1016/0003-4916(57)90049-0},
  url={https://doi.org/10.1016/0003-4916(57)90049-0}
}