P. Frampton. (2006)cite arxiv:astro-ph/0612243Comment: 7 pages latex. Talk presented at Workshop on Origin of Mass and Strong Coupling Gauge Theories. Nagoya, Japan. 21-24 November,2006.
P. Steinhardt, and N. Turok. (2001)cite arxiv:hep-th/0111098Comment: 49 pages, 6 figures, minor corrections plus added discussions on geodesic completeness, the role of the scale factor and the bounce.