Vázquez, Ruben A.; May, Jorge; Carraro, Giovanni; Bronfman, Leonardo; Moitinho, André; Baume, Gustavo (January 2008). «Spiral Structure in the Outer Galactic Disk. I. The Third Galactic Quadrant». The Astrophysical Journal672 (2): 930–939. doi:10.1086/524003. Bibcode: 2008ApJ...672..930V.
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Vázquez, Ruben A.; May, Jorge; Carraro, Giovanni; Bronfman, Leonardo; Moitinho, André; Baume, Gustavo (January 2008). «Spiral Structure in the Outer Galactic Disk. I. The Third Galactic Quadrant». The Astrophysical Journal672 (2): 930–939. doi:10.1086/524003. Bibcode: 2008ApJ...672..930V.