@misc{indiciae6ac1a04089e3,
  title = {Dipole matrix elements for helium in the first- order shielding approximation.},
  author = {Epstein, S. T. and Sando, K. M.},
  year = {1965},
  url = {https://ntrs.nasa.gov/citations/19660045575},
  note = {Source identifier: 19660045575}
}