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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 10, pp. 58–59, October, 1975.
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Kravchenko, I.N., Lobskii, M.I. & Yatsiv, D.M. Instrument for measuring slump of pyramid in determination of melting point of ash from petroleum products. Chem Technol Fuels Oils 11, 820–821 (1975). https://doi.org/10.1007/BF00718366
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DOI: https://doi.org/10.1007/BF00718366