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100   $a20000920d1991----km-y0itay50------ba
101 0 $aeng
200 1 $aVariability of Active Galaxies$eProceedings of a Workshop of the Sonderforschungbereich 328 held at Heidelberg, Germany 3-5 September 1990$fWolfgang J. Duschl, Stefan J. Wagner, Max Camenzind (Eds.)
210   $aBerlin [etc.]$cSpringer-Verlag$d1991
225 1 $aLecture notes in physics$v377
610 0 $aAstronomia
610 0 $aAstrofisica
610 0 $aCosmologia
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700  1$aDuschl,$bWolfgang J.$052830
702  1$aCamenzind,$bMax
702  1$aWagner,$bStefan J.
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