Geodesic
A certain hierarchy of sets. I
Algebra i logika, Tome 7 (1968) no. 1, pp. 47-74

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     author = {Yu. L. Ershov},
     title = {A certain hierarchy of sets. {I}},
     journal = {Algebra i logika},
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     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1968_7_1_a3/}
}
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Yu. L. Ershov. A certain hierarchy of sets. I. Algebra i logika, Tome 7 (1968) no. 1, pp. 47-74. http://geodesic.mathdoc.fr/item/AL_1968_7_1_a3/