Author	K.-H. Böhm J. Cassinelli
Year of Publication	1971
Journal Title	Astronomy and Astrophysics
Volume	12
Start Page or Article ID (correct)	21-27
Start Page or Article ID (old)	21
URL	http://adsabs.harvard.edu/full/1971A\%26A....12...21B
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	Journal Article
Publication Status	Published