(en) Adelina Gutierrez-Moreno et Hugo Moreno, « A photometric investigation of the Scorpio-Centaurus association », Astrophysical Journal Supplement, vol. 15, , p. 459 (DOI10.1086/190168, Bibcode1968ApJS...15..459G)
(en) Philip C. Keenan et Cecilia Barnbaum, « Revision and Calibration of MK Luminosity Classes for Cool Giants by HIPPARCOS Parallaxes », The Astrophysical Journal, vol. 518, no 2, , p. 859–865 (DOI10.1086/307311, Bibcode1999ApJ...518..859K)
(en) Adelina Gutierrez-Moreno et Hugo Moreno, « A photometric investigation of the Scorpio-Centaurus association », Astrophysical Journal Supplement, vol. 15, , p. 459 (DOI10.1086/190168, Bibcode1968ApJS...15..459G)
(en) Philip C. Keenan et Cecilia Barnbaum, « Revision and Calibration of MK Luminosity Classes for Cool Giants by HIPPARCOS Parallaxes », The Astrophysical Journal, vol. 518, no 2, , p. 859–865 (DOI10.1086/307311, Bibcode1999ApJ...518..859K)