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Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN3540296921, Архивировано из оригинала28 июля 2023, Дата обращения: 22 июля 2019. Радиус (R*) определяется выражением
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Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773—777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN3540296921, Архивировано из оригинала28 июля 2023, Дата обращения: 22 июля 2019. Радиус (R*) определяется выражением