Literatur
Vergl. Naturwissensch. 1920, S. 740, 1921, S. 769.
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Hopmann, J. Astronomische Mitteilungen. Naturwissenschaften 10, 440 (1922). https://doi.org/10.1007/BF01571240
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DOI: https://doi.org/10.1007/BF01571240