Porter, John M.; Rivinius, Thomas. Classical Be Stars. Publications of the Astronomical Society of the Pacific. 2003, 115 (812): 1153. Bibcode:2003PASP..115.1153P. doi:10.1086/378307.
Snow, T. P.; Marlborough, J. M. Evidence for mass loss at moderate to high velocity in Be stars. Astrophysical Journal. 1976, 203: L87. Bibcode:1976ApJ...203L..87S. doi:10.1086/182025.
Porter, John M.; Rivinius, Thomas. Classical Be Stars. Publications of the Astronomical Society of the Pacific. 2003, 115 (812): 1153. Bibcode:2003PASP..115.1153P. doi:10.1086/378307.
Snow, T. P.; Marlborough, J. M. Evidence for mass loss at moderate to high velocity in Be stars. Astrophysical Journal. 1976, 203: L87. Bibcode:1976ApJ...203L..87S. doi:10.1086/182025.