@article{ZNSL_1974_40_a14,
     author = {S. V. Pakhomov},
     title = {Some simple syntactical definition of all classes of {Grzegorczyk} hierarchy},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {127--130},
     publisher = {mathdoc},
     volume = {40},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_40_a14/}
}