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3. É. K. Keller and E. I. Kozlovskaya, “Elastic and strength properties of some glassy, glass-crystalline, and crystalline silicate materials during heating,” in: Hot Strength of Materials and Construction Elements [in Russian], No. 4, Naukova Dumka, Kiev (1967).
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5. A. F. Beloivan and G. K. Isakhanov, “Method of studying strength and deformation of brittle nonmetallic materials as a function of temperature and atmosphere,” in: Thermal Strength of Materials and Construction Elements [in Russian], No. 4, Naukova Dumka, Kiev (1967).