@misc{indiciae30920a11d867,
  title = {Analytic second derivatives for general coupled-cluster and configuration-interaction models.},
  author = {Mihály Kállay and Jürgen Gauss},
  year = {2004},
  doi = {10.1063/1.1668632},
  url = {https://pubmed.ncbi.nlm.nih.gov/15267583/},
  note = {Source identifier: 15267583}
}