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- W1548548278 abstract "Using a complete, X-ray selected sample of BL Lacertae Objects (XBLs), we find that V sub e/V sub a = 0.34 +/- 0.06 implying that the cosmological evolution of this type of AGN is 'negative'; i.e., fewer or less luminous BL Lacs in the past compared to the current epoch. In the process of deriving this result, the selection criteria and observational properties of XBLs are described." @default.
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- W1548548278 date "1991-01-01" @default.
- W1548548278 modified "2023-09-23" @default.
- W1548548278 title "The Cosmological Evolution of BL Lacertae Objects" @default.
- W1548548278 hasPublicationYear "1991" @default.
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