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1991AJ....102.1278B - Astron. J., 102, 1278 (1991)
A study of emission-line variability of the nucleus in the Seyfert galaxy NGC 4151 in 1986-1988
BOCHKAREV N.G., SHAPOVALOVA A.I. and ZHEKOV S.A.
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Simbad objects: 5
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