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@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/} }
R. Sh. Omanadze. The upper semilattice of recursively enumerable ${\rm. Algebra i logika, Tome 23 (1984) no. 2, pp. 175-184. http://geodesic.mathdoc.fr/item/AL_1984_23_2_a3/