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@article{DAN_1977_233_6_a12, author = {V. V. Fedorchuk}, title = {On $\pi$-sets}, journal = {Doklady Akademii Nauk}, pages = {1060--1063}, publisher = {mathdoc}, volume = {233}, number = {6}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_6_a12/} }
V. V. Fedorchuk. On $\pi$-sets. Doklady Akademii Nauk, Tome 233 (1977) no. 6, pp. 1060-1063. http://geodesic.mathdoc.fr/item/DAN_1977_233_6_a12/