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Four direct measurements of the fine-structure constant 13 billion years ago.
Wilczynska MR, Webb JK, Bainbridge M, Barrow JD, Bosman SEI, Carswell RF, Dąbrowski MP, Dumont V, Lee CC, Leite AC, Leszczyńska K, Liske J, Marosek K, Martins CJAP, Milaković D, Molaro P, Pasquini L. Wilczynska MR, et al. Among authors: dabrowski mp. Sci Adv. 2020 Apr 24;6(17):eaay9672. doi: 10.1126/sciadv.aay9672. Print 2020 Apr. Sci Adv. 2020. PMID: 32917582 Free PMC article.