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(en) Trevor J. David et Lynne A. Hillenbrand, « 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 Journal, , p. 146 (DOI10.1088/0004-637X/804/2/146, Bibcode2015ApJ...804..146D, arXiv1501.03154, S2CID33401607)