@article{AL_1973_12_5_a0,
     author = {V. I. Amstislavskii},
     title = {Computability with functionals},
     journal = {Algebra i logika},
     pages = {497--511},
     publisher = {mathdoc},
     volume = {12},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1973_12_5_a0/}
}