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@article{DAN_1976_228_5_a7, author = {S. V. Popov}, title = {On the complexity of derivations in classical propositional calculus}, journal = {Doklady Akademii Nauk}, pages = {1041--1044}, publisher = {mathdoc}, volume = {228}, number = {5}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_5_a7/} }
S. V. Popov. On the complexity of derivations in classical propositional calculus. Doklady Akademii Nauk, Tome 228 (1976) no. 5, pp. 1041-1044. http://geodesic.mathdoc.fr/item/DAN_1976_228_5_a7/