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FLUCTUATIONS IN THE SPACE DISTRIUBTION OF THE GALAXIES [PDF]
, 1954 Vera Rubin
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Spiral structure and the rotation of galaxies [PDF]
, 1958 B. A. Vorontsov-Vel'Yaminov
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Five thousand external galaxies and a new dense group.
, 1948 Carl Κ. Seyfert
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5. A 21-cm. line survey of the outer parts of the Galaxy [PDF]
, 1957 G. Westerhout
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Remarks on the reduction of radial velocities within spiral galaxies
, 1955 Jürgen Stock
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