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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
Mamajek, Eric E.; Hillenbrand, Lynne A. Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics. The Astrophysical Journal. November 2008, 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. arXiv:0807.1686. doi:10.1086/591785.
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.
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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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Mamajek, Eric E.; Hillenbrand, Lynne A. Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics. The Astrophysical Journal. November 2008, 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. arXiv:0807.1686. doi:10.1086/591785.
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.
Campbell, Bruce; et al. A search for substellar companions to solar-type stars. Astrophysical Journal. 1988, 331: 902–921. Bibcode:1988ApJ...331..902C. doi:10.1086/166608., pages 904, 906, and 919