Reaching micro-arcsecond astrometry with long baseline optical interferometry - Application to the GRAVITY instrument
S. Lacour, F. Eisenhauer, S. Gillessen, O. Pfuhl, J. Woillez, H. Bonnet, G. Perrin, B. Lazareff, S. Rabien, V. Lapeyrère, Y. Clénet, P. Kervella and Y. Kok
