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Spiral Structure and Nuclear Activity in Galaxies. Nature 243, 439 (1973). https://doi.org/10.1038/243439b0
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DOI: https://doi.org/10.1038/243439b0
Nature volume 243, page 439 (1973)
Spiral Structure and Nuclear Activity in Galaxies. Nature 243, 439 (1973). https://doi.org/10.1038/243439b0
Issue Date:
DOI: https://doi.org/10.1038/243439b0