VizieR online Data Catalogue associated with article published in journal Astronomical Journal (AAS) with title 'The Initial Mass Function and Massive Star Evolution in the OB Associations of the Northern Milky Way' (bibcode: 1995ApJ...454..151M)
Degioia-Eastwood, K. (Contributor), Johnson, K. E. (Contributor), Massey, P. (Contributor) (Nov 20 1995). OB Associations of the Northern Milky Way. Strasbourg Astronomical Data Center. 10.26093/cds/vizier.14540151