@article{9528,
  author = {D. Beck and H. Odabasi},
  title = {Relativistic and correlation effects for bound levels of atomic systems with three electrons},
  year = {1971},
  journal = {Annals of Physics},
  volume = {67},
  pages = {274-345},
  month = {Jan-09-1971},
  issn = {00034916},
  url = {http://linkinghub.elsevier.com/retrieve/pii/0003491671900133},
  doi = {10.1016/0003-4916(71)90013-3},
}