Geodesic
Singular integral operators along a~complex contour
Matematičeskie zametki, Tome 21 (1977) no. 3, pp. 409-414.

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Some sufficient conditions under which a singular operator with bounded measurable coefficients is a $\Phi$-operator in the space $L_2(\Gamma)$ are established. If the contour of integration is a closed Lyapunov contour, then these conditions coincide with the well-known conditions of Simonenko and are also necessary for the operator under consideration to be Noetherian. 
@article{MZM_1977_21_3_a12,
     author = {V. I. Nyaga},
     title = {Singular integral operators along a~complex contour},
     journal = {Matemati\v{c}eskie zametki},
     pages = {409--414},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_3_a12/}
}
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V. I. Nyaga. Singular integral operators along a~complex contour. Matematičeskie zametki, Tome 21 (1977) no. 3, pp. 409-414. http://geodesic.mathdoc.fr/item/MZM_1977_21_3_a12/