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3. L. I. Baron et al., Determination of the Properties of Rocks [in Russian], Gosgortekhizdat (1962).
4. R. L. Zenkov, Mechanics of Granular Charges [in Russian], Mashgiz (1962).
5. N. E. Pestov, Physicochemical Properties of Granular and Powdered Chemical Products [in Russian], Izd. AN SSSR (1947).