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Astron. Astrophys. 320, L5-L8 (1997)
Acknowledgements
The HEGRA Collaboration thanks the Instituto de Astrofisica de Canarias for use of the HEGRA site at the Roque de los Muchachos and its facilities. This work was supported by the BMBF, the DFG and the CICYT.
© European Southern Observatory (ESO) 1997
Online publication: June 30, 1998
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