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@article{AL_1972_11_2_a1, author = {A. N. Degtev}, title = {The $m$-degrees of simple sets}, journal = {Algebra i logika}, pages = {130--139}, publisher = {mathdoc}, volume = {11}, number = {2}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1972_11_2_a1/} }
A. N. Degtev. The $m$-degrees of simple sets. Algebra i logika, Tome 11 (1972) no. 2, pp. 130-139. http://geodesic.mathdoc.fr/item/AL_1972_11_2_a1/