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David, Trevor J.; Hillenbrand, Lynne A. (2015), «The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets», The Astrophysical Journal804 (2): 146, Bibcode:2015ApJ...804..146D, S2CID33401607, arXiv:1501.03154, doi:10.1088/0004-637X/804/2/146..
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David, Trevor J.; Hillenbrand, Lynne A. (2015), «The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets», The Astrophysical Journal804 (2): 146, Bibcode:2015ApJ...804..146D, S2CID33401607, arXiv:1501.03154, doi:10.1088/0004-637X/804/2/146..
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ianridpath.com
Ridpath, Ian. «Ursa Minor». Star Tales. Self-published. Consultado el 7 de marzo de 2015.Blomberg, Peter E. (2007). «¿Cómo recibió su nombre la constelación de la Osa?». En Pásztor, Emília, ed. Arqueoastronomía en Arqueología y Etnografía: Papers from the Annual Meeting of SEAC (European Society for Astronomy in Culture), held in Kecskemét in Hungary in 2004. Oxford, UK: Archaeopress. pp. 129-32. ISBN978-1-4073-0081-8.
Ridpath, Ian. «Ursa Minor». Star Tales. Self-published. Consultado el 7 de marzo de 2015.Blomberg, Peter E. (2007). «¿Cómo recibió su nombre la constelación de la Osa?». En Pásztor, Emília, ed. Arqueoastronomía en Arqueología y Etnografía: Papers from the Annual Meeting of SEAC (European Society for Astronomy in Culture), held in Kecskemét in Hungary in 2004. Oxford, UK: Archaeopress. pp. 129-32. ISBN978-1-4073-0081-8.
David, Trevor J.; Hillenbrand, Lynne A. (2015), «The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets», The Astrophysical Journal804 (2): 146, Bibcode:2015ApJ...804..146D, S2CID33401607, arXiv:1501.03154, doi:10.1088/0004-637X/804/2/146..