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Fedotov S.A., Tokarev P.I. (1973) Eartquakes, characteristics of the upper mantle under Kamchatka, and their connection with volcanism (according to data collected up to 1971) // Bulletin Volcanologique. Iss. 37. No. 2. pp. 245-257. doi: 10.1007/BF02597133.

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Marhinin E.K., Stratula D.S. (1973) Relationship between chemical composition of volcanic rocks and depth of the seismofocal layer as shown by the Kliuchevskaya volcanic Grup (Kamchatka) and the Kurile-Kamchatka Island arc // Bulletin Volcanologique. Vol. 37, Iss. 2. pp. 175-182. doi: 10.1007/BF02597129.