@article{MOMA_1992__113_4_178559,
     author = {Donald I. Cartwright},
     title = {Singularities of the {Green} {Function} of a {Random} {Walk} on a {Discrete} {Group.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {183--188},
     publisher = {mathdoc},
     volume = {113},
     number = {4},
     year = {1992},
     zbl = {0764.60065},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1992__113_4_178559/}
}