Quasi-Stellar Sources: Variation in the Radio Emission of 3C 273

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Science  11 Jun 1965:
Vol. 148, Issue 3676, pp. 1458-1460
DOI: 10.1126/science.148.3676.1458


Evidence is presented for the first time for large fractional variations in the radio emission of the quasi-stellar sources 3C 273, 3C 279, and 3C 345, all of which have flat radio spectra at centimeter wavelengths.