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@article{AL_1973_12_2_a3, author = {Yu. L. Ershov and I. A. Lavrov}, title = {The upper semilattice $L(\gamma )$}, journal = {Algebra i logika}, pages = {167--189}, publisher = {mathdoc}, volume = {12}, number = {2}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1973_12_2_a3/} }
Yu. L. Ershov; I. A. Lavrov. The upper semilattice $L(\gamma )$. Algebra i logika, Tome 12 (1973) no. 2, pp. 167-189. http://geodesic.mathdoc.fr/item/AL_1973_12_2_a3/