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© 2019 Elena K. Shematorova, Ivan Yu. Slovokhotov, Vladimir N. Shmakov, Marat R. Khaliluev, Dmitry G. Shpakovski, Valery N. Klykov, Olga G. Babak, Svetlana G. Spivak, Yuri M. Konstantinov, George V. Shpakovski, published by Latvian Academy of Sciences
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