@article{DAN_1968_178_6_a10,
     author = {\`E. R. Tsekanovskii},
     title = {Generalized selfadjoint extensions of symmetric operators},
     journal = {Doklady Akademii Nauk},
     pages = {1267--1270},
     publisher = {mathdoc},
     volume = {178},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_6_a10/}
}