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SPECTRAL CHARACTERISTICS AND ACID-BASE EQUILIBRIA OF 4,9-DIHYDROXY-5,10-DIOXO-4,5,9,10-TETRAHYDRO-4,9-DIAZAPYRENE AND ITS 2,7-DERIVATIVES СтатьяZaitsev B.E., Migachev G.I., Koval'chukova O.P., Matyushenko V.V.Chemistry of Heterocyclic Compounds. Том 29. 1993. С. 81-86