TY  - RPRT
TI  - Generalized Levinson theorem: Applications to electron-atom scattering.
AU  - L Rosenberg
AU  - L Spruch
PY  - 1996
DO  - 10.1103/physreva.54.4985
UR  - https://pubmed.ncbi.nlm.nih.gov/9914064/
ID  - 9914064
ER  -