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- [21] VARIATIONS IN RADIO-FREQUENCY SPECTRA OF 3C 84 3C 273 3C 279 AND OTHER RADIO SOURCES ASTROPHYSICAL JOURNAL, 1966, 146 (03): : 634 - +
- [30] INTENSITY VARIATIONS OF 3C 48 3C 196 + 3C 273 IN OPTICAL WAVELENGTHS ASTROPHYSICAL JOURNAL, 1964, 139 (01): : 416 - &