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Optical spectra and redshifts of 15 flat-spectrum radio sources

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Optical spectra for 15 QSO candidates, selected from optical identifications of flat-spectrum radio sources, are presented. Six of them have obvious emission line features, which confirm them to be quasars. The largest redshift is 3.45 for PKS 0335-122. Selection effects in the search for quasars with redshifts greater than 3.5 are discussed.

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Chinese Astronomy and Astrophysics

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