References
Clark, D.: New Scientist 81, 168 (1979)
Keil, K.: Naturwissenschaften 65, 432 (1978)
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Keil, K. Die unbeständige Sonne. Naturwissenschaften 66, 467–468 (1979). https://doi.org/10.1007/BF00399005
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DOI: https://doi.org/10.1007/BF00399005