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Karshenboim, Savely G. (2003). "Precision Study of Positronium: Testing Bound State QED Theory". International Journal of Modern Physics A [Particles and Fields; Gravitation; Cosmology; Nuclear Physics]. 19 (23): 3879-3896. arXiv:hep-ph/0310099. Bibcode:2004IJMPA..19.3879K. doi:10.1142/S0217751X04020142.
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harvard.edu
ui.adsabs.harvard.edu
Karshenboim, Savely G. (2003). "Precision Study of Positronium: Testing Bound State QED Theory". International Journal of Modern Physics A [Particles and Fields; Gravitation; Cosmology; Nuclear Physics]. 19 (23): 3879-3896. arXiv:hep-ph/0310099. Bibcode:2004IJMPA..19.3879K. doi:10.1142/S0217751X04020142.
web.archive.org
Lund, Mikkel D.; Thomsen, Heine D.; Uggerhøj, Ulrik I.; Knudsen, Helge (2009). "Atom nummer nul"(PDF). Aktuel Naturvidenskab. 2: 4-7. Arkiveret fra originalen(PDF) 5. marts 2016. Hentet 11. maj 2012.
