ELECTRONIC ABSORPTION SPECTRA AND STRUCTURES OF THE CONJUGATE ACIDS OF 5-HYDROXY- AND 5-AMINOANTHRAQUINONEPYRIDINES Article Zaitsev B.E., Rudnitskaya O.V., Sheban G.V., Molodkin A.K. Chemistry of Heterocyclic Compounds. Латвийский институт органического синтеза Латвийской академии наук / Springer New York Consultants Bureau. Vol. 16. 1980. P. 1248-1254