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Kamenetsky V.S., Belousov A.B., Sharygin V.V., Zhitova L.M., Ehrig K., Zelensky M. (2019) High-temperature gold-copper extraction with chloride flux in lava tubes of Tolbachik volcano (Kamchatka) // Terra Nova. Vol. 31, No. 6. pp. 511-517. doi: 10.1111/ter.12420.