@article{49381,
  author = {James Sims and Stanley Hagstrom},
  title = {Hylleraas-configuration-interaction Study of the Singlet S Ground State of Neutral Beryllium},
  year = {2011},
  number = {83},
  month = {2011-03-31},
  publisher = {Physical Review A},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=907384},
  language = {en},
}