1 | We do not consider timelike extra dimensions: see [393] for an interesting example. | |
2 | Brane-worlds without Z_{2} symmetry have also been considered; see e.g., [227] for recent work. | |
3 | DGP brane-worlds without Z_{2} symmetry have also been considered; see e.g. [394]. |
http://www.livingreviews.org/lrr-2010-5 |
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