The structure of the upper neighborhood for predicate-describable classes in $P_k$
Doklady Akademii Nauk, Tome 218 (1974) no. 2, pp. 304-307.

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     author = {S. V. Yablonskii},
     title = {The structure of the upper neighborhood for predicate-describable classes in $P_k$},
     journal = {Doklady Akademii Nauk},
     pages = {304--307},
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     volume = {218},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_218_2_a14/}
}
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S. V. Yablonskii. The structure of the upper neighborhood for predicate-describable classes in $P_k$. Doklady Akademii Nauk, Tome 218 (1974) no. 2, pp. 304-307. http://geodesic.mathdoc.fr/item/DAN_1974_218_2_a14/