@article{DAN_1967_177_6_a8,
     author = {S. S. Sannikov},
     title = {Representations of a continuous group by unbounded operators},
     journal = {Doklady Akademii Nauk},
     pages = {1285--1288},
     publisher = {mathdoc},
     volume = {177},
     number = {6},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_6_a8/}
}