@article{AL_2018_57_4_a1,
     author = {S. A. Badaev and A. A. Issakhov},
     title = {Some absolute properties of $A$-computable numberings},
     journal = {Algebra i logika},
     pages = {426--447},
     publisher = {mathdoc},
     volume = {57},
     number = {4},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2018_57_4_a1/}
}