@article{RM_1971_26_5_a20,
     author = {S. G. Krein},
     title = {Fifth {Voronezh} {Winter} {Mathematical} {School}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1971},
     volume = {26},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_5_a20/}
}