Literature cited
I. Ya. Guzman, High-Refractory Porous Ceramic [in Russian], Metallurgiya, Moscow (1971).
Inventor's Certificate No. 238388.
B. S. Cherepanov et al., in: Chemistry and Technology of Silicates, Materials for the Eleventh Mendeleev Congress [in Russian], Nauka, Moscow (1975), p. 165.
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Translated from Steklo i Keramika, No. 11, pp. 25–27, November, 1978.