Hayrapetyan, H., and P. Meliksetyan. “On Normal Solvability of a Dirichlet’s Type Problem for Improperly Elliptic Equation Third Order”. Armenian Journal of Mathematics 2, no. 1 (February 23, 2009): 13–27. Accessed May 9, 2026. http://test.armjmath.sci.am/index.php/ajm/article/view/49.