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Published online by Cambridge University Press: 14 August 2015
Observations of the quasars 3C 273 and 3C 279 at 8 mm were begun in 1967 with the 22-m radio telescope of the Crimean Astrophysical Observatory of the Academy of Sciences of the USSR and have been continued subsequently (V. A. Efanov et al., 1968, 1969, 1970a, 1970b).