\bibitem{Chassaing90}       E.Chassaing, B.Sapoval, G.Daccord, R.Lenormand  \hskip 2mm
                            {\it Experimental Study of the Impedance of Blocking Quasi-Fractal and Rough Electrodes},
                            J.Electroanal.Chem. {\bf 279}, 67-78, 1990.