Johnson, H. L.; Morgan, W. W. Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas. Astrophysical Journal. 1953, 117: 313–352. Bibcode:1953ApJ...117..313J. doi:10.1086/145697.
Makarov, Valeri V. Computing the Parallax of the Pleiades from the Hipparcos Intermediate Astrometry Data: An Alternative Approach. The Astronomical Journal. December 2002, 124 (6): 3299–3304. Bibcode:2002AJ....124.3299M. doi:10.1086/344683.
Johnson, H. L.; Morgan, W. W. Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas. Astrophysical Journal. 1953, 117: 313–352. Bibcode:1953ApJ...117..313J. doi:10.1086/145697.
Makarov, Valeri V. Computing the Parallax of the Pleiades from the Hipparcos Intermediate Astrometry Data: An Alternative Approach. The Astronomical Journal. December 2002, 124 (6): 3299–3304. Bibcode:2002AJ....124.3299M. doi:10.1086/344683.