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Die 18.6 jährige Periode der Sonnenflecken

F. Schuster
1918 Astronomical Notes - Astronomische Nachrichten  

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doi:10.1002/asna.19182080105 fatcat:cn6d56ij6jcdxgk7rqr55dbyiy
lang:de
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F. Schuster. "Die 18.6 jährige Periode der Sonnenflecken." Astronomical Notes - Astronomische Nachrichten 208.1 (1918) 5-10