Geodesic
A numerical invariant for finitely generated groups via actions on graphs.
Mathematica Scandinavica, Tome 72 (1993) no. 1, pp. 148-160

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Mots-clés : finitely generated groups, square-summable functions, Betti number, von Neumann dimension, von Neumann algebras, directed graph, harmonic functions, regular representation, amalgamated products of finite groups, subgroup of finite index 
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     author = {William L. Paschke},
     title = {A numerical invariant for finitely generated groups via actions on graphs.},
     journal = {Mathematica Scandinavica},
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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/