Astron. Astrophys. 336, 479-489 (1998)

Acknowledgements

JKK acknowledges a research grant from the Academy of Finland during the initial part of this work. We thank the anonymous referee for prompt comments. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

© European Southern Observatory (ESO) 1998

Online publication: July 20, 1998
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