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Jul 20, 2014 at 2:12 vote accept user36931
Jul 19, 2014 at 19:22 comment added Sam Nead @user36931 - the theorem that Bruno states can be found as Theorem 4.1 of "Seifert manifolds, plumbing, \mu-invariant and orientation reversing maps" by Neumann and Raymond.
Jul 19, 2014 at 18:14 history edited Bruno Martelli CC BY-SA 3.0
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Jul 19, 2014 at 18:06 history answered Bruno Martelli CC BY-SA 3.0