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1993AZh....70..241B - Astron. Zh., 70, 241-257 (1993)
New evidences for 13 year period in the optical variability of the quasar 3C 273 and its correlation with the observed parameters of the parsec-scale radio jet.
BABADZHANYANTS M.K. and BELOKON' E.T.
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Simbad objects: 5