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On the Correlation Between the Mean Period of Classical Cepheids and the Mean Star Space-density in the Milky Way

Jan Mergentaler

出版	Nakł. Wrocławskiego Tow. Naukowego; skl. gl. : Dom Ksiazki, 1952
URL	http://books.google.com.hk/books?id=d0v_C3ekuzIC&hl=&source=gbs_api