Revision history for entry Chellas, Brian F. (1980). "Another proof for the decidability of four modal logics" [CHEAPF] |
| Time | Type | Notes |
| 2011-05-16T22:38:02 | update | |
| 2010-10-10T23:01:23 | update | System / admin update - |
| 2010-09-09T16:48:10 | update | System / admin update - |
