Physics of active galactic nuclei : proceedings of the international conference, Heidelberg, 3-7 June 1991 - Duschl, W. J. (Wolfgang J.), 1958-; Wagner, S. J. (Stefan J.), 1961- (Berlin ; Springer-Verlag, 1992)
Includes bibliographical references and index.
Keywords: Active galaxies -- Congresses; Galactic nuclei -- Congresses