Geodesic
On~the inversion and on the spectrum of Wiener--Hopf matrix operators
Sbornik. Mathematics, Tome 20 (1973) no. 2, pp. 267-281

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A new method is presented for inverting and studying Weiner–Hopf matrix operators in the case when the symbol of the operator has a power series expansion that terminates in one direction or the other, and a criterion is found for (right, left, two-sided) invertibility of operators that do not involve partial indices. Using this method a new spectral property of some operator bundles is found, and necessary and sufficient conditions for the applicability of the method of reduction are established. Bibliography: 6 titles. 
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     author = {G. Khainig},
     title = {On~the inversion and on the spectrum of {Wiener--Hopf} matrix operators},
     journal = {Sbornik. Mathematics},
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G. Khainig. On~the inversion and on the spectrum of Wiener--Hopf matrix operators. Sbornik. Mathematics, Tome 20 (1973) no. 2, pp. 267-281. http://geodesic.mathdoc.fr/item/SM_1973_20_2_a4/