@article{lee1988,
  title={Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density},
  author={Chengteh Lee and Weitao Yang and Robert G. Parr},
  year={1988},
  journal={Physical review. B, Condensed matter},
  doi={10.1103/physrevb.37.785},
  url={https://doi.org/10.1103/physrevb.37.785}
}