1. Barenblatt, G.I., Zeldovich, Ya B.: Ann. Rev. Fluid Mech. 4, 285 (1972)
2. Carr, B.J., Coley, A.A.: Class Quant. Grav. 16, R31 (1999)
3. Carr, B.J.: preprint prepared for but omitted from The Origin of Structure in the Universe, (ed.), Gunzig, E., Nardone, P.: Kluwer (1993); also in General Relativity and Gravitation (9th workshop), (eds.) Eriguchi, Y. et al., p 285–305 (Hiroshima University Press, 2000)
4. Wainwright, J., Ellis, G.F.R.: Dynamical Systems in Cosmology (Cambridge University Press, Cambridge, 1997)
5. Carter, B., Henriksen, R.N.: Ann. Physique Supp. 14, 47 (1989);