TY  - RPRT
TI  - Analytic second derivatives for general coupled-cluster and configuration-interaction models.
AU  - Mihály Kállay
AU  - Jürgen Gauss
PY  - 2004
DO  - 10.1063/1.1668632
UR  - https://pubmed.ncbi.nlm.nih.gov/15267583/
ID  - 15267583
ER  -