@article{FAA_1977_11_2_a13,
     author = {L. A. Sakhnovich},
     title = {The representation of the kernel of an invertible operator},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {89--90},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1977_11_2_a13/}
}