TY  - RPRT
TI  - Bound-bound two-photon transition matrix elements for the hydrogen atom in the dipole approximation.
AU  - TA Marian
PY  - 1989
DO  - 10.1103/physreva.39.3816
UR  - https://pubmed.ncbi.nlm.nih.gov/9901701/
ID  - 9901701
ER  -