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Jones, V.F.R. (1979). An invariant for group actions. In: de la Harpe, P. (eds) Algèbres d’Opérateurs. Lecture Notes in Mathematics, vol 725. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0062620
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DOI: https://doi.org/10.1007/BFb0062620
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