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@article{SEMR_2018_15_a31, author = {B. A. Duisengaliyeva and U. U. Umirbaev}, title = {Duisengaliyeva, {B.A.,} {Umirbaev,} {U.U.,}}, journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a}, pages = {1671--1679}, publisher = {mathdoc}, volume = {15}, year = {2018}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/SEMR_2018_15_a31/} }
B. A. Duisengaliyeva; U. U. Umirbaev. Duisengaliyeva, B.A., Umirbaev, U.U.,. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 15 (2018), pp. 1671-1679. http://geodesic.mathdoc.fr/item/SEMR_2018_15_a31/