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SPECTROSCOPY OF ENERGY-GAP IN CERAMICS AND ORIENTED FILMS OF YBA2CU3O7 IN THE REGIME OF NEGATIVE LIGHT-FLUXES by Boldyrev, N, Burlakov, V, Golovashkin, A, Khadzhiiskii, Y, Kraiskaya, K, Krasnosvobodtsev, S, Lerner, I, Mitko, A, Pechen, E, Zhizhin, G