1. Apparao, K. M. V. 1985,Astrophys. J.,292, 257.
2. Apparao, K. M. V., Tarafdar, S. P. 1987,Astrophys. J.,322, 976.
3. Cox, J. P., Salpeter, E. E. 1964,Astrophys. J.,140, 485.
4. Doazan, V. 1982, inBe Stars With and Without Emission Lines eds. A. Underhill & V. Doazan, NASA Report SP-456.
5. Doazan, V. 1987,IAU Colloquium 92, eds. A. Slettebak & T. D. Snow, p. 384.