Geodesic
Spectral multiplicity of the operator of multiplication by a matrix-valued function
Funkcionalʹnyj analiz i ego priloženiâ, Tome 23 (1989) no. 3, pp. 55-56 
A. L. Vol'berg; B. M. Solomyak. Spectral multiplicity of the operator of multiplication by a matrix-valued function. Funkcionalʹnyj analiz i ego priloženiâ, Tome 23 (1989) no. 3, pp. 55-56. http://geodesic.mathdoc.fr/item/FAA_1989_23_3_a5/
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[1] Sekefalvi-Nad B., Foyash Ch., Garmonicheskii analiz operatorov v gilbertovom prostranstve, Mir, M., 1970 | MR

[2] Volberg A.L., Solomyak B.M., Funktsion. analiz i ego pril., 21:3 (1987), 1–10 | MR

[3] Solomyak B.M., DAN SSSR, 286:6 (1986), 1308–1311 | MR | Zbl

[4] Baumgärtel H., Analytic Perturbation Theory for Matrices and Operators, Springer, 1984 | MR | Zbl