@article{106714, author = {Jan Kraj\'\i \v cek}, title = {Speed-up for propositional Frege systems via generalizations of proofs}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {030}, year = {1989}, pages = {137-140}, zbl = {0675.03034}, mrnumber = {995712}, language = {en}, url = {http://dml.mathdoc.fr/item/106714} }
Krajíček, Jan. Speed-up for propositional Frege systems via generalizations of proofs. Commentationes Mathematicae Universitatis Carolinae, Tome 030 (1989) pp. 137-140. http://gdmltest.u-ga.fr/item/106714/
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