Literatur
Shapley, Harvard Circular 255 und 260.
Shapley, Mt. Wilson Contr. 151.
Ten Bruggencate, Seeliger Festschr. 1924, S. 50.
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ten Bruggencate, P., Stracke, G. Astronomische Mitteilungen. Naturwissenschaften 13, 31–32 (1925). https://doi.org/10.1007/BF01558654
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DOI: https://doi.org/10.1007/BF01558654