@article{DAN_1985_284_1_a12,
     author = {L. A. Sakhnovich},
     title = {Inverse spectral problems for systems of equations},
     journal = {Doklady Akademii Nauk},
     pages = {57--61},
     publisher = {mathdoc},
     volume = {284},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_284_1_a12/}
}