Simultaneous optical and X-ray observations of a giant flare on the ultracool dwarf LP 412-31B. Stelzer, J. H. M. M. Schmitt, G. Micela and C. LiefkeA&A, 460 2 (2006) L35-L38DOI: https://doi.org/10.1051/0004-6361:20066488
