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Translated from Ogneupory, No. 9, pp. 5–6, September, 1969.
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Rusev, R.S. State and prospective developments of the Refractories Industry of Bulgaria. Refractories 10, 529–530 (1969). https://doi.org/10.1007/BF01295326
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DOI: https://doi.org/10.1007/BF01295326