New neighbours - III. 21 new companions to nearby dwarfs, discovered with adaptive opticsJ.-L. Beuzit, D. Ségransan, T. Forveille, S. Udry, X. Delfosse, M. Mayor, C. Perrier, M.-C. Hainaut, C. Roddier, F. Roddier and E. L. MartínA&A, 425 3 (2004) 997-1008DOI: https://doi.org/10.1051/0004-6361:20048006