@article{DAN_1960_133_3_a2,
     author = {R. S. Ismagilov},
     title = {Self-adjoint extensions of a system of commuting symmetric operators},
     journal = {Doklady Akademii Nauk},
     pages = {511--514},
     publisher = {mathdoc},
     volume = {133},
     number = {3},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_3_a2/}
}