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@article{DAN_1987_294_4_a2, author = {V. P. Orevkov}, title = {Lower bounds for the lengths of deductions in arithmetic in terms}, journal = {Doklady Akademii Nauk}, pages = {784--787}, publisher = {mathdoc}, volume = {294}, number = {4}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_4_a2/} }
V. P. Orevkov. Lower bounds for the lengths of deductions in arithmetic in terms. Doklady Akademii Nauk, Tome 294 (1987) no. 4, pp. 784-787. http://geodesic.mathdoc.fr/item/DAN_1987_294_4_a2/