TY  - RPRT
TI  - Perturbation theory for strongly interacting atomic systems.
AU  - K Taulbjerg
AU  - RO Barrachina
AU  - JH Macek
PY  - 1990
DO  - 10.1103/physreva.41.207
UR  - https://pubmed.ncbi.nlm.nih.gov/9902861/
ID  - 9902861
ER  -