High-precision astrometry on the VLT/FORS1 at time scales of few daysP. F. Lazorenko, M. Mayor, M. Dominik, F. Pepe, D. Segransan and S. UdryA&A, 471 3 (2007) 1057-1067DOI: https://doi.org/10.1051/0004-6361:20077149