@article{DAN_1960_130_3_a1,
     author = {S. G. Krein},
     title = {On interpolation theorem in operator theory},
     journal = {Doklady Akademii Nauk},
     pages = {491--494},
     publisher = {mathdoc},
     volume = {130},
     number = {3},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_3_a1/}
}