@article{DAN_1962_144_3_a12,
     author = {A. V. Strauss},
     title = {Self-adjoint operators in an orthogonal sum of {Hilbert} spaces},
     journal = {Doklady Akademii Nauk},
     pages = {512--515},
     publisher = {mathdoc},
     volume = {144},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_3_a12/}
}