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@article{MZM_1991_50_4_a8, author = {A. N. Degtev}, title = {The semilattice of computable families of recursively enumerable sets}, journal = {Matemati\v{c}eskie zametki}, pages = {61--66}, publisher = {mathdoc}, volume = {50}, number = {4}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_4_a8/} }
A. N. Degtev. The semilattice of computable families of recursively enumerable sets. Matematičeskie zametki, Tome 50 (1991) no. 4, pp. 61-66. http://geodesic.mathdoc.fr/item/MZM_1991_50_4_a8/