1. Appleton, P. N. and Struck-Marcell, C., 1987, Astrophys. J., 312, 566.
2. Arp, H. C. and Madore, B. F., 1987, “A Catalogue of Southern Peculiar Galaxies and Associations”, (Cambridge University Press).
3. Few, J. M. A. and Madore, B. F., 1986, Mon. Not. Roy. Astron. Soc., 222, 673.
4. Huang, S-n and Stewart, P., 1988, Astron. Astrophys., 197, 14.
5. Lynds, R. and Toomre, A., 1976, Astrophys. J. 209, 382.