Benchmark solution ===================== Calculation method used for the reference solution -------------------------------------------------------- The reference solution is the one given in sheet SSLL11 /89 of guide VPCS. It is obtained by the method of movements in [:ref:`bib1 `]. Benchmark results ---------------------- Moves of points :math:`C` and :math:`D`. Uncertainty about the solution --------------------------- Analytical solution. Bibliographical references --------------------------- 1. RAO (J.S.): The finite element method in engineering, problem 5.1, p. 275.