Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1958_118_3_a4, author = {Ya. L. Kreinin}, title = {On perfect compact nuclei of sets, effectively different from all $\Phi$-sets}, journal = {Doklady Akademii Nauk}, pages = {436--438}, publisher = {mathdoc}, volume = {118}, number = {3}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1958_118_3_a4/} }
Ya. L. Kreinin. On perfect compact nuclei of sets, effectively different from all $\Phi$-sets. Doklady Akademii Nauk, Tome 118 (1958) no. 3, pp. 436-438. http://geodesic.mathdoc.fr/item/DAN_1958_118_3_a4/