00521nam a2200157Ia 4500008004100000020001800041040001300059082001600072100002400088245006600112260004800178300003000226500005000256650002700306650003000333191130s2004##################000#0#eng##  a9780521479110  aACLcACL  a523.112 PET  aPeterson, Bradley M  aAn introduction to active galactic nucleicBradley M Peterson  aCambridgebCambridge University Pressc2004  axvi,238 p. : ill. ; 26 cm  aIncludes bibliographical references and index  aActive galactic nuclei  aAktiver galaktischer Kern