Voir la notice de l'article provenant de la source Math-Net.Ru
@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/} }
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/