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DI- AND TRIMETHYL-SUBSTITUTED 2-AZAFLUORENES AND DIBASIC ACIDS OF 2-AZAFLUORENONE ArticleProstakov N.S., Obynochnyi A.A., Gaivoronskaya L.A., Kirillova L.M., Zvolinskii V.P.Chemistry of Heterocyclic Compounds. Том 8. 1974. С. 1509-1512