%0 Journal Article %T Theory of low-mass stars, brown dwarfs and extra-solar giant planets %A Gilles Chabrier %A Isabelle Baraffe %J Physics %D 1997 %I arXiv %X We present a review of the most recent improvements in the theory of low-mass star-like objects, in the stellar and sub-stellar domains. Comparison is made with various recent observations. %U http://arxiv.org/abs/astro-ph/9705059v1