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@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/} }
M. M. Arslanov. Completeness in the arithmetical hierarchy, and fixed points. Algebra i logika, Tome 28 (1989) no. 1, pp. 3-17. http://geodesic.mathdoc.fr/item/AL_1989_28_1_a0/