@article{DAN_1987_296_3_a5,
     author = {V. P. Orevkov},
     title = {Applications of cut elimination for obtaining bounds on the lengths of proofs},
     journal = {Doklady Akademii Nauk},
     pages = {539--542},
     publisher = {mathdoc},
     volume = {296},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_296_3_a5/}
}