@article{ZNSL_1979_88_a1,
     author = {A. P. Beltiukov},
     title = {A~machine description and a~hierarchy of initial {Grzegorczyk's} classes},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {30--46},
     publisher = {mathdoc},
     volume = {88},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_88_a1/}
}