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Optical spectroscopy of active galactic nuclei in SA57
UploadAn X-ray survey in SA 57 with XMM-Newton
UploadAn X-ray survey in SA 57 with XMM-Newton
UploadAn X-ray and optical AGN survey in SA 57
UploadSpectral Slope Variability of BL Lacertae Objects in the Optical Band
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