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An AGN sample with high X-ray-to-optical flux ratio from RASS - I. The optical identification

J. Y. Wei, D. W. Xu, X. Y. Dong and J. Y. Hu

Astron. Astrophys. Suppl. Ser., 139 3 (1999) 575-599

DOI: https://doi.org/10.1051/aas:1999514

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