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Braitseva Olga A., Ponomareva Vera V., Sulerzhitsky Leopold D., Melekestsev Ivan V., Bailey John (1997) Holocene Key-Marker Tephra Layers in Kamchatka, Russia // Quaternary Research. Vol. 47, No. 2. pp. 125-139. doi: 10.1006/qres.1996.1876.