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@article{AL_1971_10_5_a6, author = {A. B. Khutoretskii}, title = {The power of the upper semilattice of computable numerations}, journal = {Algebra i logika}, pages = {561--569}, publisher = {mathdoc}, volume = {10}, number = {5}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1971_10_5_a6/} }
A. B. Khutoretskii. The power of the upper semilattice of computable numerations. Algebra i logika, Tome 10 (1971) no. 5, pp. 561-569. http://geodesic.mathdoc.fr/item/AL_1971_10_5_a6/