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Zavala, R. T.; Hummel, C. A.; Boboltz, D. A.; Ojha, R.; Shaffer, D. B.; Tycner, C.; Richards, M. T.; Hutter, D. J. (2010). "The Algol Triple System Spatially Resolved at Optical Wavelengths". The Astrophysical Journal Letters. Quyển 715 số 1. tr. L44 –L48. arXiv:1005.0626. Bibcode:2010ApJ...715L..44Z. doi:10.1088/2041-8205/715/1/L44.
Tomkin, J.; Huisong, T. (1985). "The rotation of the primary of Algol". Publications of the Astronomical Society of the Pacific. Quyển 97. tr. 51. Bibcode:1985PASP...97...51T. doi:10.1086/131493.
Lestrade, Jean-Francois; Phillips, Robert B.; Hodges, Mark W.; Preston, Robert A. (1993). "VLBI astrometric identification of the radio emitting region in Algol and determination of the orientation of the close binary". The Astrophysical Journal. Quyển 410. tr. 808. Bibcode:1993ApJ...410..808L. doi:10.1086/172798. ISSN0004-637X.