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@article{MZM_2008_84_4_a2, author = {I. I. Batyrshin}, title = {Relative {Enumerability} in {Ershov's} {Hierarchy}}, journal = {Matemati\v{c}eskie zametki}, pages = {506--515}, publisher = {mathdoc}, volume = {84}, number = {4}, year = {2008}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_2008_84_4_a2/} }
I. I. Batyrshin. Relative Enumerability in Ershov's Hierarchy. Matematičeskie zametki, Tome 84 (2008) no. 4, pp. 506-515. http://geodesic.mathdoc.fr/item/MZM_2008_84_4_a2/