van de Hulst, Muller & Oort (1954) – The spiral structure of the outer part of the Galactic System derived from the hydrogen emission at 21 cm wavelength

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van de Hulst, H. C.; Muller, C. A.; Oort, J. H.
1954, Bulletin of the Astronomical Institutes of the Netherlands, 12, 117
http://cdsads.u-strasbg.fr/abs/1954BAN….12..117V