Geodesic
The Riemann problem and expansion of entire functions of two variables with respect to quasiexponential bases
Matematičeskie zametki, Tome 21 (1977) no. 4, pp. 473-483.

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It is shown with the aid of the two-dimensional Borel transform that the expansion of entire functions of two variables of a finite degree with respect to a system of primitive functions or with respect to the system of Ozhegov polynomials is possible only when a certain two-dimensional Riemann problem which is equivalent to the Wiener-Hopf problem for a bidomain of the form $\{|z|>r,\ |\zeta|>\rho\}$ is solvable 
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     author = {G. D. Derevyanchenko and V. A. Kakichev},
     title = {The {Riemann} problem and expansion of entire functions of two variables with respect to quasiexponential bases},
     journal = {Matemati\v{c}eskie zametki},
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G. D. Derevyanchenko; V. A. Kakichev. The Riemann problem and expansion of entire functions of two variables with respect to quasiexponential bases. Matematičeskie zametki, Tome 21 (1977) no. 4, pp. 473-483. http://geodesic.mathdoc.fr/item/MZM_1977_21_4_a3/