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Astron. Astrophys. 345, 986-998 (1999) AcknowledgementsThis work has been supported by grant No. 20-43048.95 of the Swiss National Science Foundation. We thank M. Schüssler for very helpful discussions on torsional waves. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: April 28, 1999 ![]() |