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| Austrian astronomer Rudolf Ferdinand Spitaler (1849–1946).| Austrian Academy of Sciences Press Communications in Asteroseismology , Vienna Observatory, Volume 149, December 2008, p. 121| Institut für Astronomie der Universität Wien| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Rudolf Ferdinand Spitaler.png
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