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You can find it in a paper by Jakob Stix http://www.math.uni-frankfurt.de/~stix/publikationen.html, propably in http://www.springer.com/mathematics/algebra/book/978-3-642-30673-0, Chapter 7 by Jakob Stix.
You can find it in a paper by Jakob Stix http://www.math.uni-frankfurt.de/~stix/publikationen.html, propably in http://www.springer.com/mathematics/algebra/book/978-3-642-30673-0.
You can find it in http://www.springer.com/mathematics/algebra/book/978-3-642-30673-0, Chapter 7 by Jakob Stix.
