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Astron. Astrophys. 320, 575-579 (1997)
Acknowledgements
The authors thank to the NRO interferometer group for operation of the Nobeyama Millimeter Array. I. Y. aknowledges a financial support by the Research Fellowship of Japan Society for the Promotion of Sciences.
© European Southern Observatory (ESO) 1997
Online publication: June 30, 1998
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