@article{AA_1998_10_1_a7,
     author = {L. A. Sakhnovich},
     title = {Spectral analysis of a class of canonical differential systems},
     journal = {Algebra i analiz},
     pages = {187--201},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1998_10_1_a7/}
}