@article{AL_1984_23_2_a3,
     author = {R. Sh. Omanadze},
     title = {The upper semilattice of recursively enumerable ${\rm},
     journal = {Algebra i logika},
     pages = {175--184},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1984_23_2_a3/}
}