@article{RM_1987_42_2_a30,
     author = {Yu. G. Borisovich and S. G. Krein},
     title = {XIX {Voronezh} {Winter} {Mathematical} {School}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1987_42_2_a30/}
}