TY  - RPRT
TI  - Approximations to self-consistent field molecular wavefunctions.
AU  - T A Halgren
AU  - W N Lipscomb
PY  - 1972
DO  - 10.1073/pnas.69.3.652
UR  - https://pubmed.ncbi.nlm.nih.gov/16591968/
ID  - 16591968
ER  -