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MULLER, C., OORT, J. Observation of a Line in the Galactic Radio Spectrum: The Interstellar Hydrogen Line at 1,420 Mc./sec., and an Estimate of Galactic Rotation. Nature 168, 357–358 (1951). https://doi.org/10.1038/168357a0
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DOI: https://doi.org/10.1038/168357a0
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