@article{DAN_1965_163_1_a5,
     author = {V. P. Orevkov},
     title = {Certain reduction classes and solvable classes of sequents for the constructive calculus of predicates},
     journal = {Doklady Akademii Nauk},
     pages = {30--32},
     publisher = {mathdoc},
     volume = {163},
     number = {1},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_163_1_a5/}
}