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May 25, 2016 at 22:13 comment added Robin Saunders Thanks for this answer, and especially for the references; I'm looking through the book now.
May 25, 2016 at 21:45 history edited Carlo Beenakker CC BY-SA 3.0
added 103 characters in body
May 25, 2016 at 19:40 history answered Carlo Beenakker CC BY-SA 3.0