@article{MZ_1988__199_1_173977,
     author = {Alice R. Trenholme},
     title = {A {Green's} {Function} for {Non-Homogegeous} {Random} {Walks} on {Free} {Products.}},
     journal = {Mathematische Zeitschrift},
     pages = {425--442},
     publisher = {mathdoc},
     volume = {199},
     number = {1},
     year = {1988},
     zbl = {0638.60010},
     url = {http://geodesic.mathdoc.fr/item/MZ_1988__199_1_173977/}
}