1. Aaronson, M.A.: 1987, in “Nearly Normal Galaxies”, ed. S.M. Faber, Springer (), p. 57
2. Athanassoula, E., Bosma, A., Papaioannou, S.: 1987, Astr. Ap. 179. 23.
3. Athanassoula, E., Bosma, A.: 1988, in “The Structure of the Unviverse”, I.A.U. Symp. 130, ed. J. Audouze. (in press)
4. Athanassoula, E.: 1988, in “Dark Matter”, proc. XX Rencontre de Moriond, eds. J. Audouze and J. Tranh Vanh Van. (in press)
5. Bergeron, J., Gunn, J.E.: 1977, Ap. J. 217, 892