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The simple phenomenological model of nanosize piezoresistor is proposed. The analytic description of the effect of shear strain, caused by free faces of the piezoresistor, on the normal strains epsiv1 and epsiv2 is presented. This allows correct interpretation of the experimental results. It is shown that when the cross-section of the p-type piezoresistor is less than 4000 nm2 the constants m11 and...