@article{AL_1989_28_1_a0,
     author = {M. M. Arslanov},
     title = {Completeness in the arithmetical hierarchy, and fixed points},
     journal = {Algebra i logika},
     pages = {3--17},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1989_28_1_a0/}
}