1. Tapcu, A., A contribution to the systematic analysis of finite element structures using the force method. Doctoral dissertation, University of Essen, West Germany, 1979.
2. Denke, P.H., A general digital computer analysis of statically indeterminate structures. Engineering paper 834, Douglas Aircraft Co., 1959.
3. ANSYS User's Manual. Swanson Analysis Systems, Inc., SASIP, 1994.
4. MSC/NASTRAN Quick Reference Guide, Ver. 68. MacNeal–Schwendler Corporation, 1994.
5. ABAQUS Theory Manual. Hibbitt, Karlsson and Sorensen, Inc., 1993.