@article{darden1993,
  title={Particle mesh Ewald: An N ⋅log( N ) method for Ewald sums in large systems},
  author={Tom Darden and Darrin M. York and Lee G. Pedersen},
  year={1993},
  journal={The Journal of Chemical Physics},
  doi={10.1063/1.464397},
  url={https://doi.org/10.1063/1.464397}
}