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2. A. S. Bergman and I. G. Mel'nikov, in: Porous Permeable Ceramics [in Russian], Moscow (1969), p. 3.
3. E. I. Pavlovskaya and B. F. Shibryaey, Metal-Ceramic Filters [in Russian], Moscow (1967).
4. C. Harrington and A. Ruchle, Uranium Production Technology, Van Nostrand (1959).
5. V. N. Uzhov and B. I. Myagkov, The Purification of Industrial Gases with Filters [in Russian], Moscow (1970).