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3. L. A. Galin, Contact Problems of the Theory of Elasticity [in Russian], Gostekhteorizdat (1953).
4. I. Ya. Shtaerman, Contact Problem of the Theory of Elasticity [in Russian], Gostekhteorizdat (1949).
5. D. K. Reitan and T. J. Higgins, Accurate Determination of the Capacitance of a Thin Rectangular Plate, Trans. Amer. Inst. Electr. Engrs.,75, 1 (1956).