| Reference Label | Details |
|---|---|
| note unc | The quoted uncertainty appeared to correspond to one std dev. and was multiplied by 2 to come closer to the desired 95% confidence limit |
| Korobov 2001 | V. Korobov and A. Yelkhovsky, Phys. Rev. Lett. 87, 193003/1-4 (2001) Ionization Potential of the Helium Atom Note: see also: Preprint Archive, Physics (2001) 1-4, arXiv:physics/0105108 |