@article{DAN_1969_187_6_a3,
     author = {A. G. Dragalin and V. A. Lyubetskii},
     title = {Construction of an effectively inaccessible cardinal in a natural prolongation of the {Zermelo--Fraenkel} system},
     journal = {Doklady Akademii Nauk},
     pages = {1225--1228},
     publisher = {mathdoc},
     volume = {187},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_6_a3/}
}