@article{DAN_1976_228_4_a4,
     author = {E. I. Iokhvidov},
     title = {Description of $J$-unitary extensions of $J$-isometric operators with equal and finite defect numbers},
     journal = {Doklady Akademii Nauk},
     pages = {783--786},
     publisher = {mathdoc},
     volume = {228},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_228_4_a4/}
}