@article{FAA_1989_23_3_a5,
     author = {A. L. Vol'berg and B. M. Solomyak},
     title = {Spectral multiplicity of the operator of multiplication by a matrix-valued function},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {55--56},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1989_23_3_a5/}
}