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Astron. Astrophys. 352, 363-370 (1999)

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Acknowledgements

We thank N. A. Tikhonov for a fruitful collaboration. We thank the anonymous referee for his/her useful comments, that help improving the paper. This work was partially supported by INTAS-RFBR grant 95-IN-RU-1390. AA is financially supported by the IAC (grant P3/94) and by the DGES of the Kingdom of Spain (grant PB97-1438-C02-01). NASA's Extragalactic Database (NED) has been used in our work.

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© European Southern Observatory (ESO) 1999

Online publication: December 2, 1999
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