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@article{DAN_1981_260_5_a8, author = {V. G. Kanovei and A. V. Ostrovsky}, title = {On {non-Borel} $F_\parallel$-sets}, journal = {Doklady Akademii Nauk}, pages = {1061--1064}, publisher = {mathdoc}, volume = {260}, number = {5}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1981_260_5_a8/} }
V. G. Kanovei; A. V. Ostrovsky. On non-Borel $F_\parallel$-sets. Doklady Akademii Nauk, Tome 260 (1981) no. 5, pp. 1061-1064. http://geodesic.mathdoc.fr/item/DAN_1981_260_5_a8/