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url: http://cdsads.u-strasbg.fr/abs/2011A%26A...530A.126K
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url: http://cdsads.u-strasbg.fr/abs/2011A%26A...528A.134B
Röll, T., A. Seifahrt, R. Neuhäuser, R. Köhler and J. Bean: Ground based astrometric search for extrasolar planets in stellar multiple systems. In: GAIA: At the Frontiers of Astrometry, (Eds.) Turon, C.; Meynadier, F.; Arenou, F. EDP Sciences (2011) 429-432.
url: http://cdsads.u-strasbg.fr/abs/2011EAS....45..429R
Zhao-Geisler, R., A. Quirrenbach, R. Köhler, B. Lopez and C. Leinert: The mid-infrared diameter of W Hydrae. 530 (2011).
url: http://cdsads.u-strasbg.fr/abs/2011A%26A...530A.120Z
Köhler, R.: The orbit of GG Tauri A. 530 (2011).
url: http://cdsads.u-strasbg.fr/abs/2011A%26A...530A.126K
Bergfors, C., W. Brandner, M. Janson, R. Köhler and T. Henning: VLT/NACO astrometry of the HR 8799 planetary system. L'-band observations of the three outer planets. 528, (2011).
url: http://cdsads.u-strasbg.fr/abs/2011A%26A...528A.134B
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