Variability of Active Galaxies: Proceedings of a Workshop of the Sonderforschungsbereich 328 Held at Heidelberg, Germany 3–5 September 1990 1991 · ENGLISH · PDF View details →
Variability of Active Galaxies: Proceedings of a Workshop of the Sonderforschungsbereich 328 Held at Heidelberg, Germany 3–5 September 1990 1991 · ENGLISH · DJVU View details →
