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Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I., The Astronomical Journal, October 2003, 126 (4): 2048–2059, Bibcode:2003AJ....126.2048G, arXiv:astro-ph/0308182, doi:10.1086/378365
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Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I., The Astronomical Journal, October 2003, 126 (4): 2048–2059, Bibcode:2003AJ....126.2048G, arXiv:astro-ph/0308182, doi:10.1086/378365
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Lubin, Dan; Tytler, David; Kirkman, David. Frequency of Maunder Minimum Events in Solar-type Stars Inferred from Activity and Metallicity Observations. The Astrophysical Journal Letters. March 2012, 747 (2): L32. Bibcode:2012ApJ...747L..32L. doi:10.1088/2041-8205/747/2/L32.