@article{SM_1971_13_3_a6,
     author = {Yu. L. Shmul'yan},
     title = {Extended resolvents and extended spectral functions of {a~Hermitian} operator},
     journal = {Sbornik. Mathematics},
     pages = {435--450},
     year = {1971},
     volume = {13},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_13_3_a6/}
}