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Bychkov, V. D; Bychkova, L. V; Madej, J. Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar a and B stars. Monthly Notices of the Royal Astronomical Society. 2009, 394 (3): 1338. Bibcode:2009MNRAS.394.1338B. doi:10.1111/j.1365-2966.2008.14227.x.
Abt, H. A.; Levato, H. Spectral types in the Orion OB1 association. Publications of the Astronomical Society of the Pacific. 1977, 89: 797. Bibcode:1977PASP...89..797A. doi:10.1086/130230.