@article{AL_1994_33_5_a2,
     author = {A. Nies},
     title = {The last question on recursively enumerable m-degrees},
     journal = {Algebra i logika},
     pages = {550--563},
     year = {1994},
     volume = {33},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1994_33_5_a2/}
}