1. Agmon S., Douglis A., and Nirenberg L., “Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions. I,” Comm. Pure Appl. Math., 12, 623–727 (1959).
2. Solonnikov V. A., “On boundary value problems for general linear parabolic systems of differential equations,” Trudy Steklov. Mat. Inst. Akad. Nauk SSSR, 83, 3–162 (1965).
3. Demidenko G. V., “Integral operators determined by quasielliptic equations. II,” Siberian Math. J., 35, No.1, 37–61 (1994).
4. Karapetyan G. A., “Solution of semielliptic equations in a half-space,” Trudy Mat. Inst. Steklov., 170, 119–138 (1984).
5. Vladimirov V. S., Generalized Functions in Mathematical Physics [in Russian], Nauka, Moscow (1976).