@article{FAA_1969_3_1_a9,
     author = {M. G. Krein},
     title = {Angular localization of the spectrum of a multiplicative integral in a {Hilbert} space},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {89--90},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1969_3_1_a9/}
}