1. Ashman, K. and Can, B., (1988) in proceedings of NATO ASI “The Post-Recombination Universe”, (Dordrecht:Reidel, eds N. Kaiser and A. Lasenby)
2. Bardeen, J. M., Bond, J. R., Kaiser, N. and Szalay, A. S., (1986) Astrophys. J., 304, 15.
3. Barnes, J., (1983) Mon. Not R. astr. Soc., 203, 223.
4. IAU Symp.;BJ Boyle,1988
5. Bond, J. R. and Efstathiou, G. (1984) Astrophys. J. Lett., 285, L45.