TY  - JOUR
AU  - Krajíček, Jan
TI  - Speed-up for propositional Frege systems via generalizations of proofs
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1989
SP  - 137
EP  - 140
VL  - 30
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1989__30_1_a16/
LA  - en
ID  - CMUC_1989__30_1_a16
ER  -