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@article{DA_1980_20_a3, author = {A. V. Kozina}, title = {A classification problem}, journal = {Diskretnyj analiz i issledovanie operacij}, pages = {41--48}, publisher = {mathdoc}, number = {20}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DA_1980_20_a3/} }
A. V. Kozina. A classification problem. Diskretnyj analiz i issledovanie operacij, no. 20 (1980), pp. 41-48. http://geodesic.mathdoc.fr/item/DA_1980_20_a3/