%0 Journal Article %A Ishiwata, Satoshi %T A Berry-Esseen Type Theorem on Nilpotent Covering Graphs %J Canadian journal of mathematics %D 2004 %P 963-982 %V 56 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2004-044-4/ %R 10.4153/CJM-2004-044-4 %F 10_4153_CJM_2004_044_4