Geodesic
Criterion for uniform invertibility of families of strong approximations to one-dimensional singular integral operators with continuous coefficients
Matematičeskie zametki, Tome 62 (1997) no. 3, pp. 430-439.

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A criterion is obtained for the applicability of the approximation method based on strongly approximating operator families converging to a one-dimensional singular integral operator with coefficients continuous in the circle. Some special cases are considered. 
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     title = {Criterion for uniform invertibility of families of strong approximations to one-dimensional singular integral operators with continuous coefficients},
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V. S. Pilidi. Criterion for uniform invertibility of families of strong approximations to one-dimensional singular integral operators with continuous coefficients. Matematičeskie zametki, Tome 62 (1997) no. 3, pp. 430-439. http://geodesic.mathdoc.fr/item/MZM_1997_62_3_a11/

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