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2. A.F. Wells, Structural Inorganic Chemistry, 5th ed., vol. 3, Clarendon, Oxford, 1986, p. 564.
3. S.A. Dembovsky, E.A. Chechetkina, Glass Formation, Nauka, Moscow, 1990, p. 279.
4. Medium-range structural order in covalent amorphous solids
5. Determinations of structure and bonding in vitreous B2O3by means of B10, B11, and O17NMR