TY  - RPRT
TI  - Quantum-defect parametrization of perturbative two-photon ionization cross sections.
AU  - MG Fink
AU  - P Zoller
PY  - 1989
DO  - 10.1103/physreva.39.2933
UR  - https://pubmed.ncbi.nlm.nih.gov/9901587/
ID  - 9901587
ER  -