Precision multi-epoch astrometry with VLT cameras FORS1/2 P. F. Lazorenko, M. Mayor, M. Dominik, F. Pepe, D. Segransan and S. Udry A&A, 505 2 (2009) 903-918 Published online: 11 August 2009 DOI: 10.1051/0004-6361/200912026