Coordinates: (173.92°, 0.32°)
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1. ^ Bhatt, B. C., Pandey, A. K., Mahra, H. S., et al. (1994). "CCD photometry of galactic open star clusters-III. NGC 1931", Bulletin of the Astronomical Society of India, Vol. 22, 291-302. [1994BASI...22..291B]
2. ^ Moffat, A. F. J., Jackson, P. D., & Fitzgerald, M. P. (1979). "The rotation and structure of the galaxy beyond the solar circle. I - Photometry and spectroscopy of 276 stars in 45 H II regions and other young stellar groups toward the galactic anticentre", Astronomy and Astrophysics Supplement Series, Vol. 38, 197-225. [1979A&AS...38..197M]