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Adelman, S. J.; Nasson, M. A. (June 1980), "Abundance analyses of Theta Aquilae /B9.5 III/, Nu Capricorni /B9.5 V/, and Sigma Aquarii /AO IVs/", Publications of the Astronomical Society of the Pacific, 92: 346–356, Bibcode:1980PASP...92..346A, doi:10.1086/130675.
van Rensbergen, W.; De Loore, C.; Jansen, K. (February 2006), "Evolution of interacting binaries with a B type primary at birth", Astronomy and Astrophysics, 446 (3): 1071–1079, Bibcode:2006A&A...446.1071V, doi:10.1051/0004-6361:20053543.