@article{141501,
  author = {Craig Sansonetti and John Gillaspy},
  title = {Absolute Ionization Energy of the 2<sup>1</sup>S Level of Helium},
  year = {1992},
  number = {45},
  month = {1992-01-01},
  publisher = {Physical Review A (Atomic, Molecular and Optical Physics)},
  language = {en},
}