Operator approach to approximation problems
Algebra i analiz, Tome 9 (1997) no. 6, pp. 90-108.

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@article{AA_1997_9_6_a3,
     author = {V. I. Gorbachuk and M. L. Gorbachuk},
     title = {Operator approach to approximation problems},
     journal = {Algebra i analiz},
     pages = {90--108},
     publisher = {mathdoc},
     volume = {9},
     number = {6},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1997_9_6_a3/}
}
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V. I. Gorbachuk; M. L. Gorbachuk. Operator approach to approximation problems. Algebra i analiz, Tome 9 (1997) no. 6, pp. 90-108. http://geodesic.mathdoc.fr/item/AA_1997_9_6_a3/