@misc{indiciaef42b96c5a0bc,
  title = {Nonadiabatic hyperspherical approach to two-electron systems.},
  author = {D Cordes and PL Altick},
  year = {1988},
  doi = {10.1103/physreva.38.5479},
  url = {https://pubmed.ncbi.nlm.nih.gov/9900283/},
  note = {Source identifier: 9900283}
}