\bibitem{Mulder90}      W.H.Mulder, J.H.Sluyters, T.Pajkossy, L.Nyikos   \hskip 2mm
                        {\it Tafel Current at Fractal Electrodes: Connection with Admittance Spectra},
                        J.Electroanal.Chem. {\bf 285}, 103-115, 1990.