@article{DAN_1965_165_4_a5,
     author = {Ya. L. Kreinin},
     title = {On $C\Phi$-kernels of sets effectively different from $\Phi$-sets},
     journal = {Doklady Akademii Nauk},
     pages = {752--755},
     publisher = {mathdoc},
     volume = {165},
     number = {4},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_4_a5/}
}