Approximation of harmonic functions on compact sets in ?
The direct theorem of the theory of approximation of harmonic functions is established in the case of functions defined on a compact set, the complement of which with respect to ? is a John domain.
English version (Springer): Ukrainian Mathematical Journal 45 (1993), no. 11, pp 1649-1658.
Citation Example: Andrievskii V. V. Approximation of harmonic functions on compact sets in ? // Ukr. Mat. Zh. - 1993. - 45, № 11. - pp. 1467–1475.