Geodesic
Factorization of almost periodic matrix-valued functions and the Noether theory for certain classes of equations of convolution type
Izvestiya. Mathematics , Tome 34 (1990) no. 2, pp. 281-316

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The authors study $n$- and $d$-normality and compute the index of systems of singular integral equations with a semi-almost periodic matrix-valued coefficient $G$, as well as the index of operators of convolution type on the half-line and a finite interval converging to it. At the base of the investigation lies factorization with almost periodic factors of matrix-valued functions describing the asymptotics of $G$ at $\pm\infty$. Bibliography: 38 titles. 
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     author = {Yu. I. Karlovich and I. M. Spitkovsky},
     title = {Factorization of almost periodic matrix-valued functions and the {Noether} theory for certain classes of equations of convolution type},
     journal = {Izvestiya. Mathematics },
     pages = {281--316},
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     number = {2},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_34_2_a3/}
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Yu. I. Karlovich; I. M. Spitkovsky. Factorization of almost periodic matrix-valued functions and the Noether theory for certain classes of equations of convolution type. Izvestiya. Mathematics , Tome 34 (1990) no. 2, pp. 281-316. http://geodesic.mathdoc.fr/item/IM2_1990_34_2_a3/