Bibcode
                                    
                            DOI
                                    
                            Kidger, M. R.
    Bibliographical reference
                                    Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Oct. 1988, p. 1248-1252. CAICYT-supported research.
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                        10
            
                        1988
            
  Citations
                                    14
                            Refereed citations
                                    14
                            Description
                                    Johnson B CCD photometry of quasars and other active nuclei were
obtained with the 1-m and 2.5-m reflectors of the Roque de los Muchachos
Observatory in the Canary Islands between 1986 and 1987. Data are
presented for PKS 1538+149, 3C 345, 3C 351, and BL Lac. Error sources
are discussed, and it is noted that at least part of the error is due to
uncertainties in the magnitudes of the observed sequence stars.