1. Peebles, P. J. E. Principles of Physical Cosmology (Princeton Univ. Press, USA, 1993).
2. Weinberg, S. Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity (Wiley, New York, 1972).
3. Peebles, P. J. E. Nature 321, 27–32 (1986).
4. Cho, H. T. & Kantowski, R. A Measure on a Subspace of FRW Solutions and the “Flatness Problem” of Standard Cosmology. Preprint (Department of Physics and Astronomy, University of Oklahoma, Norman, 1994).
5. Gibbons, G. W., Hawking, S. W. & Stewart, J. M. Nucl. Phys. B281, 736–751 (1987).