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1. Chiang-Mei Chen, Gal'tsov D.V., Gutperle M. S-brane Solutions in Supergravity Theories,
Phys.Rev. D66 (2002) 024043, hep-th/0204071.
2. Quevedo F. Lectures on string/brane cosmology, Class.Quant.Grav. 19 (2002) 5721,
arXiv:hep-th/0210292.
3. Gutperle M., Kallosh R., Linde A. M/String Theory, S-branes and Accelerating Universe,
JCAP 0307 (2003), 001, arXiv:hep-th/0304225.
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