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@article{AL_1991_30_4_a1, author = {R. Sh. Omanadze}, title = {On the upper semilattice of recursively enumerable ${\rm}, journal = {Algebra i logika}, pages = {405--413}, publisher = {mathdoc}, volume = {30}, number = {4}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1991_30_4_a1/} }
R. Sh. Omanadze. On the upper semilattice of recursively enumerable ${\rm. Algebra i logika, Tome 30 (1991) no. 4, pp. 405-413. http://geodesic.mathdoc.fr/item/AL_1991_30_4_a1/