TY  - RPRT
TI  - Nonadiabatic hyperspherical approach to two-electron systems.
AU  - D Cordes
AU  - PL Altick
PY  - 1988
DO  - 10.1103/physreva.38.5479
UR  - https://pubmed.ncbi.nlm.nih.gov/9900283/
ID  - 9900283
ER  -