SOPHIE velocimetry of Kepler transit candidates - XIII. KOI-189 b and KOI-686 b: two very low-mass stars in long-period orbits
R. F. Díaz, G. Montagnier, J. Leconte, A. S. Bonomo, M. Deleuil, J. M. Almenara, S. C. C. Barros, F. Bouchy, G. Bruno, C. Damiani, G. Hébrard, C. Moutou and A. Santerne
