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Title: Method for quaternization of nitrogen-containing heterocyclic azo dyes
authors: D. Simov, T. Deligeorgiev, N. Gadjev, A. Penchev
journal: Dyes and Pigments, Volume 15, Issue 2, 1991, Pages 83–88

DOI:

http://dx.doi.org/10.1016/0143-7208(91)87009-C

link:

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http://www.sciencedirect.com/science/article/pii/014372089187009C

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