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Astron. Astrophys. 357, 37-50 (2000)

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Acknowledgements

We are grateful to Michelle Mizuno, Lutz Wisotzki, and specially Alain Smette for their valuable comments on early drafts. We also thank Olaf Wucknitz for calculations concerning the gravitational-lens hypothesis. S. L. acknowledges support by the BMBF (DARA) under grant No. 50 OR 9905.

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© European Southern Observatory (ESO) 2000

Online publication: May 3, 2000
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