Geodesic
Aizenberg formula in nonconvex domains and some its applications
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 39, Tome 389 (2011), pp. 206-231 
A. Rotkevich. Aizenberg formula in nonconvex domains and some its applications. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 39, Tome 389 (2011), pp. 206-231. http://geodesic.mathdoc.fr/item/ZNSL_2011_389_a11/
@article{ZNSL_2011_389_a11,
     author = {A. Rotkevich},
     title = {Aizenberg formula in nonconvex domains and some its applications},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {206--231},
     year = {2011},
     volume = {389},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2011_389_a11/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The paper concerns the operator determined by the kernel of the Aizenberg integral representation for holomorphic functions. A special class of domains such that this operator acts from $C^\alpha(\partial\Omega)$ to $H^\alpha(\Omega)$ is introduced. An example of a nonconvex domain that belongs to this class is described.

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[3] D. Gilbarg, N. Trudinger, Ellipticheskie differentsialnye uravneniya s chastnymi proizvodnymi vtorogo poryadka, Nauka, 1989 | MR | Zbl

[4] U. Rudin, Teoriya funktsii v edinichnom share iz $\mathbb C^n$, Mir, M., 1984 | MR | Zbl