@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/}
}