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2. G. Heinicke, Tribochemistry (Berlin: Akademie Verlag, 1984).
3. E.G. Avvakumov, Mechanochemical Methods of the Activation of Chemical Processes (Novosibirsk: Nauka, 1986).
4. A.Z. Juhasz and L. Opoczky, Mechanical Activation of Minerals by Grinding (Budapest, Hungary: Akademia Kiado, 1990).
5. Zvi Goffer, Archaeological Chemistry, A Sourcebook on the Applications of Chemistry to Archaeology (New York: John Wiley & Sons, 1980), p. 208.