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Continue to ChatCERTAIN INTEGRAL AND DIFFERENTIAL TYPES OF VARIATIONAL-PRINCIPLES IN NONLINEAR PIEZOELECTRICITY - https://avesis.itu.edu.tr/yayin/f3d676c1-6ce2-45ff-8175-83eeee1c0a41/certain-integral-and-differential-types-of-variational-principles-in-nonlinear-piezoelectricity