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                <dcterms:bibliographicCitation>A. Shapovalova, L. Popović, S. Collin, A. Burenkov, V. Chavushyan, N. Bochkarev, D. Ilić, A. Mercado, Long-term variability of the optical spectra of NGC 4151, Astronomical and Astrophysical Transactions, Vol. 27, No. 3, pp. 429 - 432, 2012</dcterms:bibliographicCitation>
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