Barstow, M. A.; et al. (May 2014), "Evidence for an external origin of heavy elements in hot DA white dwarfs", Monthly Notices of the Royal Astronomical Society, 440 (2): 1607–1625, arXiv:1402.2164, Bibcode:2014MNRAS.440.1607B, doi:10.1093/mnras/stu216.
Smalley, B.; et al. (January 1997), "The chemical composition and binarity of beta Crateris", Monthly Notices of the Royal Astronomical Society, 284 (2): 457–464, Bibcode:1997MNRAS.284..457S, doi:10.1093/mnras/284.2.457.
Barstow, M. A.; et al. (May 2014), "Evidence for an external origin of heavy elements in hot DA white dwarfs", Monthly Notices of the Royal Astronomical Society, 440 (2): 1607–1625, arXiv:1402.2164, Bibcode:2014MNRAS.440.1607B, doi:10.1093/mnras/stu216.
Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
Smalley, B.; et al. (January 1997), "The chemical composition and binarity of beta Crateris", Monthly Notices of the Royal Astronomical Society, 284 (2): 457–464, Bibcode:1997MNRAS.284..457S, doi:10.1093/mnras/284.2.457.
Barstow, M. A.; et al. (May 2014), "Evidence for an external origin of heavy elements in hot DA white dwarfs", Monthly Notices of the Royal Astronomical Society, 440 (2): 1607–1625, arXiv:1402.2164, Bibcode:2014MNRAS.440.1607B, doi:10.1093/mnras/stu216.
Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.