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Vázquez, Ruben A.; May, Jorge; Carraro, Giovanni; Bronfman, Leonardo; Moitinho, André; Baume, Gustavo (јануар 2008). „Spiral Structure in the Outer Galactic Disk. I. The Third Galactic Quadrant”. The Astrophysical Journal. 672 (2): 930—939. Bibcode:2008ApJ...672..930V. S2CID55908842. arXiv:0709.3973. doi:10.1086/524003.CS1 одржавање: Формат датума (веза)
Israelian, Garik (1997). „Obituary: Victor Amazaspovich Ambartsumian, 1912 [i.e. 1908] -1996”. Bulletin of the American Astronomical Society. 29 (4): 1466—1467. Bibcode:1997BAAS...29.1466I.
Herbst, W. (1976). „R associations. I - UBV photometry and MK spectroscopy of stars in southern reflection nebulae”. Astronomical Journal. 80: 212—226. Bibcode:1975AJ.....80..212H. doi:10.1086/111734.