Voir la notice de l'article provenant de la source Math-Net.Ru
@article{FAA_1975_9_3_a14, author = {E. A. Gutkin}, title = {Overcomplete subspace systems and operator symbols}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {89--90}, publisher = {mathdoc}, volume = {9}, number = {3}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1975_9_3_a14/} }
E. A. Gutkin. Overcomplete subspace systems and operator symbols. Funkcionalʹnyj analiz i ego priloženiâ, Tome 9 (1975) no. 3, pp. 89-90. http://geodesic.mathdoc.fr/item/FAA_1975_9_3_a14/