Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years

Journal article published in 1994 by B. M. Peterson, P. Berlind, R. Bertram, N. G. Bochkarev, D. Bond, Brotherton, Busler, K. K. Chuvaev, R. D. Cohen, M. Dietrich, M. Elvis, A. Filippenko, C. B. Foltz, P. M. Garnavich, L. C. Ho and other authors.

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