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Weakest normal calculi with respect to Mn-counterparts
Jerzy J. Błaszczuk
Bulletin of the Section of Logic , 7 /3 (1978) s. 102-106 -
Remarks on Mn-counterparts of some normal calculi
Jerzy J. Błaszczuk
Bulletin of the Section of Logic , 6 /2 (1977) s. 82-95