...Survey
Based on observations obtained at the German-Spanish Astronomical Center, Calar Alto, Spain, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy.
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...Survey
Figures 4 to 14 are available with the electronic version of the paper at http://www.edpsciences.com
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...quasars
Tables 2-4 are also available in electronic form via anonymous ftp at cdsarc.u-strasbg.fr (130.79.128.5) or on the web via http://cdsweb.u-strasbg.fr/Abstract.html
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...Survey
The Digitized Sky Survey, 1994, CD-ROM Version, Space Telescope Science Institute.
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Copyright by the European Southern Observatory (ESO)