@article{AL_1973_12_1_a0,
     author = {N. V. Beljakin},
     title = {A certain class of recursive hierarchies},
     journal = {Algebra i logika},
     pages = {3--21},
     year = {1973},
     volume = {12},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1973_12_1_a0/}
}