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@article{DM_1989_1_2_a6, author = {N. R. Emel'yanov}, title = {Complexity of the solution of the problem of $\alpha$-expressibility in $k$-valued logic}, journal = {Diskretnaya Matematika}, pages = {65--77}, publisher = {mathdoc}, volume = {1}, number = {2}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DM_1989_1_2_a6/} }
N. R. Emel'yanov. Complexity of the solution of the problem of $\alpha$-expressibility in $k$-valued logic. Diskretnaya Matematika, Tome 1 (1989) no. 2, pp. 65-77. http://geodesic.mathdoc.fr/item/DM_1989_1_2_a6/