Index sets of classes of hyperhypersimple sets
Algebra i logika, Tome 29 (1990) no. 2, pp. 220-240.

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@article{AL_1990_29_2_a7,
     author = {V. L. Selivanov},
     title = {Index sets of classes of hyperhypersimple sets},
     journal = {Algebra i logika},
     pages = {220--240},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1990_29_2_a7/}
}
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V. L. Selivanov. Index sets of classes of hyperhypersimple sets. Algebra i logika, Tome 29 (1990) no. 2, pp. 220-240. http://geodesic.mathdoc.fr/item/AL_1990_29_2_a7/