@article{DAN_1976_229_3_a5,
     author = {A. G. Rutkas},
     title = {On the theory of characteristic functions of linear operators},
     journal = {Doklady Akademii Nauk},
     pages = {546--549},
     publisher = {mathdoc},
     volume = {229},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_229_3_a5/}
}