Fresh models suggest only one planet around Gliese might be habitable.
References
Selsis, F. et al. Astronomy and Astrophysics (in the press) http://arxiv.org/PS_cache/arxiv/pdf/0710/0710.5294v1.pdf
von Bloh, W., Bounama, C., Cuntz, M. & Franck, S. Astronomy and Astrophysics (in the press) http://arxiv.org/PS_cache/arxiv/pdf/0705/0705.3758v3.pdf
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Sanderson, K. Earth-like planets get life assessment. Nature (2007). https://doi.org/10.1038/news.2007.212
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DOI: https://doi.org/10.1038/news.2007.212
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