David, Trevor J.; Hillenbrand, Lynne A. (2015), “The Ages of Early-Type Stars: Stromgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets”, The Astrophysical Journal804 (2): 146, arXiv:1501.03154, Bibcode: 2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
David, Trevor J.; Hillenbrand, Lynne A. (2015), “The Ages of Early-Type Stars: Stromgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets”, The Astrophysical Journal804 (2): 146, arXiv:1501.03154, Bibcode: 2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009), “Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo”, Astronomy and Astrophysics493 (3): 1099-1107, Bibcode: 2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.
Knobel, E. B. (June 1895). “Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket”. Monthly Notices of the Royal Astronomical Society55: 430. Bibcode: 1895MNRAS..55..429K. doi:10.1093/mnras/55.8.429.
David, Trevor J.; Hillenbrand, Lynne A. (2015), “The Ages of Early-Type Stars: Stromgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets”, The Astrophysical Journal804 (2): 146, arXiv:1501.03154, Bibcode: 2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009), “Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo”, Astronomy and Astrophysics493 (3): 1099-1107, Bibcode: 2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.
Knobel, E. B. (June 1895). “Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket”. Monthly Notices of the Royal Astronomical Society55: 430. Bibcode: 1895MNRAS..55..429K. doi:10.1093/mnras/55.8.429.