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2. PARIS, R. A. & BARON, T. G., Eur. Pat. No. 23869, 2 Nov. 1981.
3. Nitriding of clays and kaolins for the production of sialons;Boyarina;Proizvod Spetos Ogneupory,1981
4. The structure of sialon obtained by nitridation of kaolin;Gavrish;Inorg. Mater.,1982
5. Sialon based on natural clay raw materials;Boyarina;Refractories,1982