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CYCLIZATION PROCESS AT DISSOCIATION OF MOLECULAR-IONS OF N-(AZAFLUORENYLIDENE-9)AMINES ArticleSHEVTSOV V.K., ZAKHAROV P.I., ZVOLINSKII V.P., PLESHAKOV V.G., GRIGORYEV G.V., PROSTAKOV N.S.Chemistry of Heterocyclic Compounds / KHIMIYA GETEROTSIKLICHESKIKH SOEDINENII. 1981. P.. 102-109