@article{DAN_1985_283_2_a1,
     author = {M. M. Arslanov},
     title = {Lattice properties of the degrees below $O'$},
     journal = {Doklady Akademii Nauk},
     pages = {270--273},
     publisher = {mathdoc},
     volume = {283},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_283_2_a1/}
}