@article{RM_1993_48_6_a23,
     author = {S. G. Krein},
     title = {XXV {Voronezh} {Winter} {Mathematical} {School}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1993},
     volume = {48},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1993_48_6_a23/}
}