Geodesic
A certain hierarchy of sets. III
Algebra i logika, Tome 9 (1970) no. 1, pp. 34-51 
Yu. L. Ershov. A certain hierarchy of sets. III. Algebra i logika, Tome 9 (1970) no. 1, pp. 34-51. http://geodesic.mathdoc.fr/item/AL_1970_9_1_a2/
@article{AL_1970_9_1_a2,
     author = {Yu. L. Ershov},
     title = {A certain hierarchy of sets. {III}},
     journal = {Algebra i logika},
     pages = {34--51},
     year = {1970},
     volume = {9},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1970_9_1_a2/}
}
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