@article{izmaylov2017entanglement,
  title={Entanglement in the Born--Oppenheimer approximation},
  author={Izmaylov, Artur F and Franco, Ignacio},
  journal={Journal of chemical theory and computation},
  volume={13},
  number={1},
  pages={20--28},
  year={2017},
  publisher={ACS Publications}
}