@article{DAN_1991_317_4_a8,
     author = {V. A. Derkach},
     title = {Generalized resolvents of a class of {Hermitian} operators in a {Krein} space},
     journal = {Doklady Akademii Nauk},
     pages = {807--812},
     year = {1991},
     volume = {317},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_4_a8/}
}