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when toggle format what by license comment
Feb 16, 2013 at 11:24 comment added Stefan Kohl I have edited my answer, giving you some hints where to look. However I don't have the books at hand, so I cannot check.
Feb 16, 2013 at 11:22 history edited Stefan Kohl CC BY-SA 3.0
The OP is interested rather in a reference.
Feb 15, 2013 at 17:31 history answered Stefan Kohl CC BY-SA 3.0