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Astron. Astrophys. 321, 660-664 (1997)
Acknowledgements
The authors acknowledge support of our works on GPM1 provided by grant from the ESO. We would like to thank all collaborators participating in the programme "Hipparcos extragalactic link by photographic astrometry".
© European Southern Observatory (ESO) 1997
Online publication: June 30, 1998
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