1. Arnold D.N., Brezzi F., Cockburn B. and Marini L.D., Unified analysis of discontinuous Galerkin methods for elliptic problems.SIAM J. Numer. Anal.39(2002) 1749–1779.
2. Babuška I. and Guo B.Q., Theh-pversion of the finite element method for domains with curved boundaries.SIAM J. Numer. Anal.25(1988) 837–861.
3. Babuška I. and Guo B.Q., Regularity of the solution of elliptic problems with piecewise analytic data. I. Boundary value problems for linear elliptic equation of second order.SIAM J. Math. Anal.19(1988) 172–203.
4. Babuška I. and Guo B.Q., Theh-pversion of the finite element method for problems with nonhomogeneous essential boundary condition.Comput. Methods Appl. Mech. Engrg.74(1989) 1–28.
5. Babuška I. and Guo B.Q., Regularity of the solution of elliptic problems with piecewise analytic data. II. The trace spaces and application to the boundary value problems with nonhomogeneous boundary conditions.SIAM J. Math. Anal.20(1989) 763–781.