1. P.J. Peebles: Nature 321, 27 (1986)
2. J. Bahcall, S. Casertano: Astrophys. J. 293, L7 (1985)
3. M. Turner: Proceed, of. Cargése Summer School on Fundam. interactions and Cosmology 1984 (ed.: J. Audouze, J. Tran Thank Van)
4. T. Shanks: Vistas in Astron 28, 595 (1985)
5. F. Luccin, S. Matarrese, N. Vittorio: Astron.Astrophys. 152, 13 (1986)