\bibitem{Agarwal95}     P.~Agarwal, M.E.~Orazem, L.H.~Garcia-Rubio,
                        {\it Application of Measurement Models to Impedance Spectroscopy. 
                        III. Evaluation of Consistancy with the Kramers-Kronig Relations},
                        J. Electrochem. Soc. {\bf 142} (12), 4159, 1995.