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Astron. Astrophys. 358, L67-L70 (2000)
Acknowledgements
R.Z. and V.C. thank the E.U. for financial support of the PhD in Physics at the University of Catania through the FSE. M.R. is Research Associate of the FNRS (Belgium).
© European Southern Observatory (ESO) 2000
Online publication: June 20, 2000
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