1. Aitken, D. K. and Roche, P. F. 1983, Mon. Not. R. Ast. Soc, 202, 1233.
2. Allamandola, L. J. 1984, Absorption and Emission Characteristics of Interstellar Dust in Galactic and Extragalactic Infrared Spectroscopy, eds. Kessler, M. F. and Philips, J. P. (D. Reidel Publishing Co., Dordrecht), 5.
3. Allamandola, L. J. and Norman, C. A. 1978, Astro. Ap., 66, 129.
4. Allamandola, L. J., Tielens, A. G. G. M. and Barker, J. R. 1985, Ap. J. Letters, 290, L25, (ATBa).
5. Allamandola, L. J., Tielens, A. G. G. M. and Barker, J. R. 1987, in Polycyclic Aromatic Hydrocarbons and Astrophysics, eds. Leger, A. and d’Hendecourt, L. B. (D. Reidel Publishing Co., Dordrecht),255, (ATBb).