Revision history for entry Ackermann, Wilhelm (1950). "Widerspruchsfreier aufbau der logik I: Typenfreies system ohne tertium non datur" [ACKWAD]

NB: for privacy reasons, few details are provided in public revision histories.
TimeTypeNotes
2013-11-22T06:44:17updateSystem / admin update -
2013-11-04T04:24:06updateSystem / admin update -
2011-02-01T03:17:47update