@article{11610,
  author = {D. Beck and Richard Zare},
  title = {Relativistic and non-relativistic configuration interaction calculations for atoms having a closed core and two valence spin-orbitals},
  year = {1969},
  journal = {Computer Physics Communications},
  volume = {1},
  pages = {113-134},
  month = {Jan-10-1969},
  issn = {00104655},
  doi = {10.1016/0010-4655(69)90005-8},
}