%0 Journal Article %A Ying Xiong %A Lifeng Xi %T Lipschitz equivalence of graph-directed fractals %J Studia Mathematica %D 2009 %P 197-205 %V 194 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm194-2-6/ %R 10.4064/sm194-2-6 %G en %F 10_4064_sm194_2_6