TY  - RPRT
TI  - Two-electron excitations in atomic calcium. I.
AU  - CH Greene
AU  - L Kim
PY  - 1987
DO  - 10.1103/physreva.36.2706
UR  - https://pubmed.ncbi.nlm.nih.gov/9899175/
ID  - 9899175
ER  -