1. F. Grashof, in: Theoretische Machinenlehre, vol. 2(1883) , pp.112-119.
2. Shukla G, Mallik A K. in: Mechanisms and Machine Theory, Vol. 35(2000), pp.911-926.
3. Guo Xiao-ning, Chu Jin-kui, in: Transactions of the Chinese Society for Agricultural Machinery, vol. 35(2004), pp.120-123.
4. Guo Xiao-ning, Chu Jin-kui, in: Mechanical Science and Technology of China. vol. 23. (2004), pp.325-328.
5. Chu Jin-kui, Guo Xiao-ning, in:. Chinese Journal of Mechanical engineering. Vol. 40(2004), pp.26-34.