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@article{AL_1979_18_6_a2, author = {A. N. Degtev}, title = {Some results on upper semilattices and $m$-degrees}, journal = {Algebra i logika}, pages = {664--679}, publisher = {mathdoc}, volume = {18}, number = {6}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1979_18_6_a2/} }
A. N. Degtev. Some results on upper semilattices and $m$-degrees. Algebra i logika, Tome 18 (1979) no. 6, pp. 664-679. http://geodesic.mathdoc.fr/item/AL_1979_18_6_a2/