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Murphy, R. E. (November 1969), "A spectroscopic investigation of visual binaries with B-type primaries.", Astronomical Journal, 74: 1082–1094, Bibcode:1969AJ.....74.1082M, doi:10.1086/110908.
Peters, G. J. (February 1979), "An analysis of the far-ultraviolet spectra of the pole-on Be stars Upsilon Cygni and MU Centauri", Astrophysical Journal Supplement Series, 39: 175–193, Bibcode:1979ApJS...39..175P, doi:10.1086/190570.