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Translated from Ogneupory, No. 12, pp, 7–9, December, 1978.
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Norkina, A.S., Fil', A.A. & Itson, T.I. Certification of products for the state quality label is an important criterion of the work of an enterprise. Refractories 19, 741–743 (1978). https://doi.org/10.1007/BF01285710
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DOI: https://doi.org/10.1007/BF01285710