@article{FAA_1987_21_3_a11,
     author = {S. M. Kozlov},
     title = {A criterion for instability of systems of linear equations},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {81--82},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_3_a11/}
}