Slettebak, A. Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars. Astrophysical Journal Supplement Series. 1982, 50: 80, 55–83. Bibcode:1982ApJS...50...55S. doi:10.1086/190820.
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Bohlender, D. Searching for and Monitoring Ae and a Shell Stars at the DAO. Bright Emissaries: Be Stars as Messengers of Star-Disk Physics. 2016, 506: 275. Bibcode:2016ASPC..506..275B.
Slettebak, A. Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars. Astrophysical Journal Supplement Series. 1982, 50: 80, 55–83. Bibcode:1982ApJS...50...55S. doi:10.1086/190820.