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@article{MS2_1993__72_1_167243, author = {William L. Paschke}, title = {A numerical invariant for finitely generated groups via actions on graphs.}, journal = {Mathematica Scandinavica}, pages = {148--160}, publisher = {mathdoc}, volume = {72}, number = {1}, year = {1993}, zbl = {0812.20020}, url = {http://geodesic.mathdoc.fr/item/MS2_1993__72_1_167243/} }
William L. Paschke. A numerical invariant for finitely generated groups via actions on graphs.. Mathematica Scandinavica, Tome 72 (1993) no. 1, pp. 148-160. http://geodesic.mathdoc.fr/item/MS2_1993__72_1_167243/