Astrometric planet search around southern ultracool dwarfs - I. First results, including parallaxes of 20 M8–L2 dwarfsJ. Sahlmann, P. F. Lazorenko, D. Ségransan, E. L. Martín, M. Mayor, D. Queloz and S. UdryA&A, 565 (2014) A20DOI: https://doi.org/10.1051/0004-6361/201323208
