@article{DAN_1958_123_6_a3,
     author = {O. M. Kozlov},
     title = {Fractional powers of self-adjoined extensions of operators and some boundary problems},
     journal = {Doklady Akademii Nauk},
     pages = {971--974},
     publisher = {mathdoc},
     volume = {123},
     number = {6},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_123_6_a3/}
}