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Astron. Astrophys. 320, 74-78 (1997)

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Acknowledgements

We are grateful to Dr C. Prosser for pointing out additional correlations between AK, Pels and Hertzsprung numbering systems. This work has been supported by continuous grants from the Swiss National Foundation for Scientific Research (FNRS).

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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