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.
J. Khoury, B. Ovrut, P. Steinhardt, and N. Turok. (2001)cite arxiv:hep-th/0103239Comment: 67 pages, 4 figures. v2,v3: minor corrections, references added.