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edited Nov 9, 2009 at 3:38

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Some examples and further references (and an interesting setting) are given in this paper by Laca:

http://arxiv.org/abs/math/9911135

See section 1.1, pages 2-3.

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created Nov 9, 2009 at 3:30

7.3k
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Some examples and further references are given in this paper by Laca:

http://arxiv.org/abs/math/9911135

See section 1.1, pages 2-3.