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@article{AL_1973_12_5_a1, author = {V. V. V'yugin}, title = {Certain examples of upper semilattices of computable numerations}, journal = {Algebra i logika}, pages = {512--529}, publisher = {mathdoc}, volume = {12}, number = {5}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1973_12_5_a1/} }
V. V. V'yugin. Certain examples of upper semilattices of computable numerations. Algebra i logika, Tome 12 (1973) no. 5, pp. 512-529. http://geodesic.mathdoc.fr/item/AL_1973_12_5_a1/