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V. A. Perepelitsyn, F. L. Kapustin, A. A. Ponomarenko, K. G. Zemlyanoi, Z. G. Ponomarenko, L. P. Yakovleva, L. А. Rechneva, A. Yu. Kolobov. "SECONDARY MINERAL RESOURCES FOR REFRACTORY PRODUCTION. PART I. SILICA TECHNOLOGICAL MATERIALS." NOVYE OGNEUPORY (NEW REFRACTORIES) (2017) 7-16