@article{ZNSL_1972_32_a11,
     author = {G. E. Mints},
     title = {Derivability of admissible rules},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {85--89},
     year = {1972},
     volume = {32},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_32_a11/}
}