TY  - RPRT
TI  - Multiphoton ionization in a short-range potential: A nonperturbative approach.
AU  - SM Susskind
AU  - SC Cowley
AU  - EJ Valeo
PY  - 1990
DO  - 10.1103/physreva.42.3090
UR  - https://pubmed.ncbi.nlm.nih.gov/9904379/
ID  - 9904379
ER  -