@article{ZNSL_1971_20_a6,
     author = {N. K. Kossovski},
     title = {On algorithmical sequences belonging to the initial class of {Grzegorczyk} hierarchy},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {60--66},
     publisher = {mathdoc},
     volume = {20},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_20_a6/}
}