Lucky Imaging survey for southern M dwarf binariesC. Bergfors, W. Brandner, M. Janson, S. Daemgen, K. Geissler, T. Henning, S. Hippler, F. Hormuth, V. Joergens and R. KöhlerA&A, 520 (2010) A54DOI: https://doi.org/10.1051/0004-6361/201014114