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2. G.F.Zakis, Funktsional’nyi analiz ligninov i ikh proizvodnykh (Functional Analysis of Lignins and Their Derivatives), Zinatne, Riga, 1987. (in Russian).
3. R. J. Woods and A. K. Pikaev, Applied Radiation Chemistry: Radiation Processing, Wiley-Intersciense, New York, 1994.
4. G. Cserep, I. Gyorgy, M. Roder and L.Wojnarovits, Radiation Chemistry of Hydrocarbons, Akad. Kiado, Budapest, 1981.