@article{MAN_1989__284_4_164552,
     author = {Wolfgang Woess},
     title = {Amenable group actions on infinite graphs.},
     journal = {Mathematische Annalen},
     pages = {251--266},
     year = {1989},
     volume = {284},
     number = {4},
     zbl = {0648.43002},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164552/}
}