@article{ZNSL_1988_174_a5,
     author = {V. P. Orevkov},
     title = {Schemes of proof in {Hilbert-type} axiomatic theories},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {132--146},
     publisher = {mathdoc},
     volume = {174},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1988_174_a5/}
}