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We have observed fringes from 31 compact radio sources, including eight known or suspected galaxies and 20 known or suspected QSSs, by using the Goldstack interferometer at X = 3.8 cm / = 108). Fringe visibility curves were obtained for nine sources showing structure on a scale of 10-2 sec of arc, and simple models are fitted to the data. Results for 3C 273 and 3C 279 are compared wfth data taken by Knight et at. at an earlier epoch. The apparent changes in brightness distribution of 3C 273 and 3C 279 are difficult to explain.
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Cohen et al. (1971) studied this question.
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