@article{FAA_1987_21_3_a0,
     author = {A. L. Vol'berg and M. Z. Solomyak},
     title = {Multiplicity of the spectrum of {Toeplitz} operators, weighted cocycles and the vector {Riemann} problem},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_3_a0/}
}