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Armstrong, J. T; Hummel, C. A; Quirrenbach, A; Buscher, D. F; Mozurkewich, D; Vivekanand, M; Simon, R. S; Denison, C. S; Johnston, K. J; Pan, X.-P; Shao, M; Colavita, M. M (1992). "The orbit of Phi Cygni measured with long-baseline optical interferometry - Component masses and absolute magnitudes". Astronomical Journal. 104: 2217. Bibcode:1992AJ....104.2217A. doi:10.1086/116396.
Armstrong, J. T; Hummel, C. A; Quirrenbach, A; Buscher, D. F; Mozurkewich, D; Vivekanand, M; Simon, R. S; Denison, C. S; Johnston, K. J; Pan, X.-P; Shao, M; Colavita, M. M (1992). "The orbit of Phi Cygni measured with long-baseline optical interferometry - Component masses and absolute magnitudes". Astronomical Journal. 104: 2217. arXiv:1304.2530. Bibcode:1992AJ....104.2217A. doi:10.1086/116396.