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4. I. N. Demidov, V. P. Il’ina, T. S. Shelekhova, et al., “Prospects for using diatomites of Karelia,” in: Proceedings of the 2nd International Scientific Conference on the Problems of Rational Use of Natural and Technogenic Raw Materials from the Barents Region in Building and Technical Materials Technology [in Russian], Petrozavodsk (2005), pp. 55–57.