Certain special classes of topological spaces and $\delta s$-operations
Doklady Akademii Nauk, Tome 115 (1957) no. 5, pp. 866-868.

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@article{DAN_1957_115_5_a3,
     author = {I. I. Parovichenko},
     title = {Certain special classes of topological spaces and $\delta s$-operations},
     journal = {Doklady Akademii Nauk},
     pages = {866--868},
     publisher = {mathdoc},
     volume = {115},
     number = {5},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_5_a3/}
}
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I. I. Parovichenko. Certain special classes of topological spaces and $\delta s$-operations. Doklady Akademii Nauk, Tome 115 (1957) no. 5, pp. 866-868. http://geodesic.mathdoc.fr/item/DAN_1957_115_5_a3/