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when toggle format what by license comment
Dec 1, 2015 at 20:15 comment added Jan M. That second source is fantastic. Thanks!
Nov 28, 2015 at 20:46 vote accept Jan M.
Nov 28, 2015 at 16:56 history edited Carlo Beenakker CC BY-SA 3.0
added 4 characters in body
Nov 28, 2015 at 16:50 history answered Carlo Beenakker CC BY-SA 3.0