Revision history for entry Boolos, George (1982). "On the nonexistence of certain normal forms in the logic of provability" [BOOOTN]

NB: for privacy reasons, few details are provided in public revision histories.
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2016-06-30T08:04:52updateSystem / admin update -
2015-02-05T01:52:44updateSystem / admin update -
2013-11-22T07:02:58updateSystem / admin update -
2013-11-04T05:51:28updateSystem / admin update -