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2. M. Mannsmann, in: Ullmann's Encyclopädie der technischen Chemie, Vol. 11, Verlag Chemie, Weinheim (1976), p. 382.
3. H. S. Katz and J. V. Milewski (eds.), Handbook of Fillers and Reinforcements for Plastics, Van Nostrand Reinhold, New York (1978).
4. D. B. Derzhiev, V. N. Zueva, and V. E. Khazanov, Some Characteristics of Production of Polycrystalline Aluminum Oxide Fibers, Review Data, Fiber Glass and Fiber Glass Plastics Series [in Russian], NIITEKhim, Moscow (1988).
5. B. F. Ormont, The Structure of Inorganic Compounds [in Russian], Gostekhteoretizdat, Moscow ? Leningrad (1950), pp. 503, 630.