TY  - RPRT
TI  - Photoionization cross section of hydrogenic atoms: A generating function solution.
AU  - N Shafer
AU  - R Bersohn
PY  - 1990
DO  - 10.1103/physreva.42.1313
UR  - https://pubmed.ncbi.nlm.nih.gov/9904157/
ID  - 9904157
ER  -