@article{MZ_1990__205_3_174188,
     author = {Wolfgang Woess and Paolo M. Soardi},
     title = {Amenability, unimodularity, and the spectral radius of random walks on finite graphs.},
     journal = {Mathematische Zeitschrift},
     pages = {471--486},
     publisher = {mathdoc},
     volume = {205},
     number = {3},
     year = {1990},
     zbl = {0693.43001},
     url = {http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174188/}
}