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Johnson, H. L.; Morgan, W. W. (May 1953), "Fundamental stellar photometry for standards of spectral type on the Revised System of the Yerkes Spectral Atlas", Astrophysical Journal, 117: 313, Bibcode:1953ApJ...117..313J, doi:10.1086/145697.{{citation}}: CS1 maint: year (link)
Makarov, Valeri V. (October 2003), "The 100 Brightest X-Ray Stars within 50 Parsecs of the Sun", The Astronomical Journal, 126 (4): 1996–2008, Bibcode:2003AJ....126.1996M, doi:10.1086/378164.