Boundary properties of second-order partial derivatives of the Poisson integral for a half-space ℝ + k + 1 ( k > 1 ) . Topuria, S. — 1998 Georgian Mathematical Journal
Generalized derivatives of an arbitrary order and the boundary properties of differentiated Poisson integrals for the half-space ℝ + k + 1 ( k > 1 ) . Topuria, S. — 2000 Georgian Mathematical Journal
Boundary properties of first-order partial derivatives of the Poisson integral for the half-space ℝ k + 1 + ( k > 1 ) . Topuria, S. — 1997 Georgian Mathematical Journal