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MASS-SPECTROMETRY STUDY OF 9-SUBSTITUTED 10-SILA-2-AZAANTHRACENES ArticleVARLAMOV A.V., SHEVTSOV V.K., KLOCHKOV A.M., PROSTAKOV N.S.Chemistry of Heterocyclic Compounds / KHIMIYA GETEROTSIKLICHESKIKH SOEDINENII. 1984. P.. 1071-1076