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Rajendra Bhatia, John A. Holbrook, Fréchet Derivatives of the Power Function, Indiana University Mathematics Journal, Vol. 49, No. 3 (Fall, 2000), pp. 1155-1173 ...
Zhimin Zhang, Derivative Superconvergent Points in Finite Element Solutions of Harmonic Functions: A Theoretical Justification, Mathematics of Computation, Vol. 71, No. 240 (Oct., 2002), pp. 1421-1430 ...