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1933PNAS...19..591S - Proc. Nat. Acad. Sci., 19, 591-596 (1933)
Luminosity distribution and average density of matter in twenty-five groups of galaxies.
SHAPLEY H.
Journal keyword(s):
Nomenclature: Table 1: [S33] NN (Nos 1-25)
Simbad objects: 25
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