1. G. W. Brindley and M. Nakahira, “The kaolinite-mullite reaction series: III. The high temperature phases,” J. Amer. Ceram. Soc., 28, No. 2, 203 – 205 (1961).
2. E. I. Mel’nichenko, D. G. Épov, G. F. Krysenko, et al., “Processes of silicon removal during treatment and enrichment of mineral raw material with ammonium hydrofluoride,” ZhPKh, 69, No. 8, 12848 – 1251 (1996).
3. É. G. Rakov, Chemistry and Technology of Inorganic Fluorides [in Russian], MKhTI Mendeleeva, Moscow (1990).
4. I. I. Nemets, N. S. Bel’maz, and A. I. Netertsov, “Creation of ceramic material self-reinforced with acicular mullite crystals,” Trudy MKhTI, No. 123, 30 – 33 (1982).