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Ueda, Y. (2006). Notes on Treeability and Costs for Discrete Groupoids in Operator Algebra Framework. In: Bratteli, O., Neshveyev, S., Skau, C. (eds) Operator Algebras. Abel Symposia, vol 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-34197-0_13
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