ADDITIONAL LITERATURE: J.E. Gunn, M. S. Longair, M.J. Rees, Observational Cosmology, Saas-Fee Lectures, 1978. E.W. Kolb & M.S. Turner, The Early Universe, Addison-Wesley, 1990. J.D. North, The Measure of the Universe, Dover, 1990 J.A. Peacock, Cosmological Physics, Cambridge Univ Press, 1999. P.J.E. Peebles, Physical Cosmology, Princeton Univ Press, 1971. P.J.E. Peebles, The Large-Scale Structure of the Universe, Princeton Univ Press, 1980. P.J.E. Peebles, Principles of Physical Cosmology, Princeton Univ Press, 1993. M. Rowan-Robinson, Cosmology, 3rd edn., Oxford Univ Press, 1996. B. Ryden, Introduction to Cosmology, Addison Wesly, 2003