1. ANSYS, 2004. ANSYS release 8.1 documentation preview, Swanson Analysis System, Inc., Houston.
2. Braun SG, Erwins DJ, Rao SS (2001) Encyclopedia of vibration, 1–3. Academic Press-A Division of Hartcourt, Inc, London
3. Dawe DJ (1984) Matrix and finite element displacement analysis of structures. Clarendon, Oxford
4. El-Khasawneh and Ferreira, 1999. El-Khasawneh,B.S., Ferreira, P.M., 1996. Computation of stiffness and stiffness bounds for parallel link manipulators, International Journal of Machine Tools and Manufacture, pp. 321-342
5. Frederick AL, Dominic JD (2009) Strength and stiffness of engineering systems. Springer, New York