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when toggle format what by license comment
Feb 18, 2016 at 21:20 comment added Fernando Muro @IliasAmrani as it's said in the first paragraph, examples are to be found in the paper by Hilton and Roitberg, which Vladimir links to in his answer.
Feb 18, 2016 at 19:21 comment added Ilias A. Thanks for the reference! could you tell me exactly where are the examples in the reference ?
Feb 18, 2016 at 12:51 history answered Fernando Muro CC BY-SA 3.0