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Borra, E. F.; Landstreet, J. D. (December 1975), "Discovery of magnetic fields in four southern Ap stars", Publications of the Astronomical Society of the Pacific, 87: 961–963, Bibcode:1975PASP...87..961B, doi:10.1086/129880, S2CID121297510.
Mathys, G.; et al. (June 1997), "The mean magnetic field modulus of AP stars", Astronomy and Astrophysics Supplement Series, 123 (2): 353–402, Bibcode:1997A&AS..123..353M, doi:10.1051/aas:1997103.
Borra, E. F.; Landstreet, J. D. (December 1975), "Discovery of magnetic fields in four southern Ap stars", Publications of the Astronomical Society of the Pacific, 87: 961–963, Bibcode:1975PASP...87..961B, doi:10.1086/129880, S2CID121297510.