@article{GDZPPN002487993,
title = {Singularities of the Green Function of a Random Walk on a Discrete Group.},
journal = {Monatshefte f\"ur Mathematik},
volume = {114},
year = {1992},
pages = {183-188},
zbl = {0764.60065},
url = {http://dml.mathdoc.fr/item/GDZPPN002487993}
}
Cartwright, Donald I. Singularities of the Green Function of a Random Walk on a Discrete Group.. Monatshefte für Mathematik, Tome 114 (1992) pp. 183-188. http://gdmltest.u-ga.fr/item/GDZPPN002487993/