Szukana fraza: [Abstract = "In the paper, a simple method for improving the convergence rate and accuracy of finite\-element computations is presented. It is based on a discrete formulation of the problems on certain types of superelements and uses the formal\-series technique. It makes possible a uniform treatment of problems with corner singularities and an improvement of accuracy in ordinary FEM computations, without any increase in the dimensionality of the problem."]