@article{DAN_1991_316_1_a13,
     author = {V. F. Krotov},
     title = {Observation of linear systems, and principles of quantum},
     journal = {Doklady Akademii Nauk},
     pages = {57--61},
     publisher = {mathdoc},
     volume = {316},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_1_a13/}
}