@article{FAA_1983_17_1_a14,
     author = {A. E. Lifshits},
     title = {Spectral properties of degenerate systems of ordinary differential equations on a finite interval},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {77--78},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1983_17_1_a14/}
}