Webb، John K.؛ Murphy، Michael T.؛ Flambaum، Victor V.؛ Dzuba، Vladimir A.؛ Barrow، John D.؛ Churchill، Chris W.؛ Prochaska، Jason X.؛ Wolfe، Arthur M. (2000). "Further Evidence for Cosmological Evolution of the Fine Structure Constant". Physical Review Letters. ج. 87 ع. 9: 091301. arXiv:astro-ph/0012539. Bibcode:2001PhRvL..87i1301W. DOI:10.1103/PhysRevLett.87.091301. PMID:11531558.
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Webb، John K.؛ Murphy، Michael T.؛ Flambaum، Victor V.؛ Dzuba، Vladimir A.؛ Barrow، John D.؛ Churchill، Chris W.؛ Prochaska، Jason X.؛ Wolfe، Arthur M. (2000). "Further Evidence for Cosmological Evolution of the Fine Structure Constant". Physical Review Letters. ج. 87 ع. 9: 091301. arXiv:astro-ph/0012539. Bibcode:2001PhRvL..87i1301W. DOI:10.1103/PhysRevLett.87.091301. PMID:11531558.
Webb، John K.؛ Murphy، Michael T.؛ Flambaum، Victor V.؛ Dzuba، Vladimir A.؛ Barrow، John D.؛ Churchill، Chris W.؛ Prochaska، Jason X.؛ Wolfe، Arthur M. (2000). "Further Evidence for Cosmological Evolution of the Fine Structure Constant". Physical Review Letters. ج. 87 ع. 9: 091301. arXiv:astro-ph/0012539. Bibcode:2001PhRvL..87i1301W. DOI:10.1103/PhysRevLett.87.091301. PMID:11531558.
Webb، John K.؛ Murphy، Michael T.؛ Flambaum، Victor V.؛ Dzuba، Vladimir A.؛ Barrow، John D.؛ Churchill، Chris W.؛ Prochaska، Jason X.؛ Wolfe، Arthur M. (2000). "Further Evidence for Cosmological Evolution of the Fine Structure Constant". Physical Review Letters. ج. 87 ع. 9: 091301. arXiv:astro-ph/0012539. Bibcode:2001PhRvL..87i1301W. DOI:10.1103/PhysRevLett.87.091301. PMID:11531558.