@article{AL_1989_28_1_a5,
     author = {V. L. Selivanov},
     title = {Applications of precomplete numerations to $tt$-degrees and
},
     journal = {Algebra i logika},
     pages = {75--82},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1989_28_1_a5/}
}