1. Bazell and Dwek, E.: ApJ 360, 142 (1990)
2. Bohren, C.F., Huffman, D.R.: in Absorption and Scattering of Light by Small Particles, Wiley, New York, p. 217 (1983)
3. Bradley, J.P., Humecki, H.J., Germany, M.S.: ApJ 394, 643 (1992)
4. Brooke, T.Y., Knacke, R.F., Joyce, R.R.: A&A 187, 621 (1987)
5. Brownlee, D.: in Cosmic Dust, McDonnell, J.A.M. (ed.), Wiley, New York, p. 295 (1978)