(en) H. L. Johnsonet al., « UBVRIJKL photometry of the bright stars », Communications of the Lunar and Planetary Laboratory, vol. 4, no 99, (Bibcode1966CoLPL...4...99J)
(en) E. J. de Geus, P. T. de Zeeuw et J. Lub, « Physical parameters of stars in the Scorpio-Centaurus OB association », Astronomy & Astrophysics, vol. 216, nos 1-2, , p. 44–61 (Bibcode1989A&A...216...44D)