\bibitem{Hanan98}       W.G.~Hanan, D.M.~Heffernan, J.C.~Earnshaw,
                        {\it Left-Sided Multifractality of the Harmonic Measure on 2D Cluster-Cluster Aggregates},
                        Chaos, Solitons and Fractals {\bf 9}, 875, 1998.