1. Y.C. Wu and S.L. Lin: Applied Mechanics and Materials Vol. 52-54 (2011), p.279.
2. C.H. Hsu and T.C. Wen, in: Proceedings of the 11th National Conference on the Design of Mechanisms and Machines, Hsinchu, Taiwan (2008), Paper No. A1N-51943 (in Chinese).
3. L.C. Hsieh and T.H. Chen, in: Proceedings of the 9th National Conference on the Design of Mechanisms and Machines, Kaohsiung, Taiwan (2006), p.351 (in Chinese).
4. C.H. Hsu and Y.C. Wu: Proceedings of the National Science Council (Taiwan), Part A, Vol. 22 (1998), p.670.
5. Y.C. Wu and P.W. Ren: Applied Mechanics and Materials, Vols. 284-287 (2013), p.810.