Long-term variability of the optical spectra of NGC 4151
A. I. Shapovalova(Irkutsk State University), J. León-Tavares(Aalto University), А. Н. Буренков, D. Ilić(Universität Hamburg), Luka Č. Popović(Chinese Academy of Sciences), Andjelka B. Kovačević(Chinese Academy of Sciences), N. G. Bochkarev(Astronomical Institute of the Slovak Academy of Sciences), V. Chavushyan(National Institute of Astrophysics, Optics and Electronics)
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