@article{DAN_1969_189_3_a3,
     author = {A. G. El'kin},
     title = {Irreducible spaces, and ultrafilters topologically dense in themselves},
     journal = {Doklady Akademii Nauk},
     pages = {464--467},
     publisher = {mathdoc},
     volume = {189},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_189_3_a3/}
}