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Zeller, S.; Kunitski, M.; Voigtsberger, J.; Kalinin, A.; Schottelius, A.; Schober, C.; Waitz, M.; Sann, H. et al. (20 December 2016). “Imaging the He2 quantum halo state using a free electron laser”. Proceedings of the National Academy of Sciences113 (51): 14651-14655. arXiv:1601.03247. Bibcode: 2016PNAS..11314651Z. doi:10.1073/pnas.1610688113. ISSN0027-8424.
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Guilhaus, M.; Brenton, A. G.; Beynon, J. H.; Rabrenovic, M.; Schleyer, P. von Rague (14 September 1984). “First observation of He22+: charge stripping of He2+ using a double-focusing mass spectrometer”. Journal of Physics B: Atomic and Molecular Physics17 (17): L605-L610. Bibcode: 1984JPhB...17L.605G. doi:10.1088/0022-3700/17/17/010.
Grisenti, R.; Schollkopf, W.; Toennies, J.; Hegerfeldt, G.; Kohler, T.; Stoll, M. (September 2000). “Determination of the Bond Length and Binding Energy of the Helium Dimer by Diffraction from a Transmission Grating”. Physical Review Letters85 (11): 2284-2287. Bibcode: 2000PhRvL..85.2284G. doi:10.1103/PhysRevLett.85.2284. PMID10977992.
Zeller, S.; Kunitski, M.; Voigtsberger, J.; Kalinin, A.; Schottelius, A.; Schober, C.; Waitz, M.; Sann, H. et al. (20 December 2016). “Imaging the He2 quantum halo state using a free electron laser”. Proceedings of the National Academy of Sciences113 (51): 14651-14655. arXiv:1601.03247. Bibcode: 2016PNAS..11314651Z. doi:10.1073/pnas.1610688113. ISSN0027-8424.