Preibisch, T.; Mamajek, E. (2008). "The Nearest OB Association: Scorpius-Centaurus (Sco OB2)". Handbook of Star-Forming Regions. 2. arXiv:0809.0407. Bibcode:2008hsf2.book..235P.
Preibisch, T.; Mamajek, E. (2008). "The Nearest OB Association: Scorpius-Centaurus (Sco OB2)". Handbook of Star-Forming Regions. 2. arXiv:0809.0407. Bibcode:2008hsf2.book..235P.