^ アストロフィジカルジャーナルより ^ Zhang, B.; et al. (2012-08), “The distance and size of the red hypergiant NML Cygni from VLBA and VLA astrometry”, Astronomy & Astrophysics 544: A42, Bibcode: 2012A&A...544A..42Z, doi:10.1051/0004-6361/201219587 ^ B. F. Lane, A. Retter, R. R. Thompson, J. A. Eisner (April 2005). “Interferometric Observations of V838 Monocerotis”. The Astrophysical Journal Letters 622 (2): L137